All Gemstones

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various Semi-Precious Gems

Achroite

Hardness: 7.0

various Semi-Precious Gems

Actinolite

Hardness: 5.5

various Semi-Precious Gems

Adamite

Hardness: 3.5

various Semi-Precious Gems

Adularia

Hardness: 6.0

various Semi-Precious Gems

Aegirine

Hardness: 6.0

various Semi-Precious Gems

Afghanite

Hardness: 5.5

various Collector Gems

Agalmatolite

Hardness: 1.0

various Semi-Precious Gems

Agate

Hardness: 6.5

white Semi-Precious Gems

Agate Opal

Hardness: 5.5

various Collector Gems

Alabaster

Hardness: 2.0

various Semi-Precious Gems

Albite

Hardness: 6.0

various Semi-Precious Gems

Alexandrite

Hardness: 8.5

various Semi-Precious Gems

Allanite

Hardness: 0.0

various Semi-Precious Gems

Almandine

Hardness: 7.0

various Semi-Precious Gems

Almandine-Pyrope

Hardness: 7.5

various Semi-Precious Gems

Amazonite

Hardness: 6.0

various Organic Gems

Amber

Hardness: 2.0

various Semi-Precious Gems

Amblygonite

Hardness: 6.0

purple Semi-Precious Gems

Amethyst

Hardness: 7.0

various Semi-Precious Gems

Ametrine

Hardness: 7.0

various Organic Gems

Ammolite

Hardness: 4.0

various Semi-Precious Gems

Analcime (Analcite)

Hardness: 5.0

various Semi-Precious Gems

Anatase

Hardness: 5.5

various Semi-Precious Gems

Andalusite

Hardness: 7.5

various Semi-Precious Gems

Andesine

Hardness: 6.0

various Semi-Precious Gems

Andradite

Hardness: 6.5

various Semi-Precious Gems

Anglesite

Hardness: 3.0

various Semi-Precious Gems

Anhydrite

Hardness: 3.5

various Semi-Precious Gems

Anorthite

Hardness: 6.0

various Semi-Precious Gems

Anorthoclase

Hardness: 6.0

various Semi-Precious Gems

Anthophyllite

Hardness: 5.5

various Semi-Precious Gems

Antigorite

Hardness: 5.0

various Semi-Precious Gems

Anyolite

Hardness: 6.0

various Semi-Precious Gems

Apatite

Hardness: 5.0

various Semi-Precious Gems

Apophyllite Group

Hardness: 4.5

blue Semi-Precious Gems

Aquamarine

Hardness: 7.5

various Semi-Precious Gems

Aragonite

Hardness: 3.5

various Semi-Precious Gems

Astrophyllite

Hardness: 3.0

various Semi-Precious Gems

Augelite

Hardness: 4.5

various Semi-Precious Gems

Augite

Hardness: 5.5

various Semi-Precious Gems

Aventurine

Hardness: 7.0

various Semi-Precious Gems

Axinite

Hardness: 6.5

various Semi-Precious Gems

Azurite

Hardness: 3.5

green Semi-Precious Gems

Azurmalachite

Hardness: 3.5

various Semi-Precious Gems

Baddeleyite

Hardness: 6.5

various Semi-Precious Gems

Baryte (Barite)

Hardness: 3.0

various Semi-Precious Gems

Bastnäsite

Hardness: 4.0

various Semi-Precious Gems

Benitoite

Hardness: 6.0

various Semi-Precious Gems

Bertrandite

Hardness: 6.0

various Semi-Precious Gems

Beryl

Hardness: 7.5

various Semi-Precious Gems

Beryllonite

Hardness: 5.5

various Semi-Precious Gems

Bikolite

Hardness: 5.5

various Semi-Precious Gems

Binghamite

Hardness: 6.5

white Semi-Precious Gems

Black Opal

Hardness: 6.0

various Semi-Precious Gems

Bloodstone (Heliotrope)

Hardness: 6.5

various Semi-Precious Gems

Blue Beryl (Maxixe)

Hardness: 7.5

various Semi-Precious Gems

Blue John

Hardness: 4.0

various Semi-Precious Gems

Boleite

Hardness: 3.0

various Semi-Precious Gems

Boracite

Hardness: 7.0

white Semi-Precious Gems

Boulder Opal

Hardness: 5.0

various Semi-Precious Gems

Bowenite

Hardness: 5.0

various Semi-Precious Gems

Brazilianite

Hardness: 5.5

various Semi-Precious Gems

Bronzite

Hardness: 5.5

various Semi-Precious Gems

Brookite

Hardness: 5.5

various Collector Gems

Brucite

Hardness: 2.5

various Semi-Precious Gems

Bustamite

Hardness: 5.5

various Semi-Precious Gems

Bytownite

Hardness: 6.0

various Semi-Precious Gems

Calcite

Hardness: 3.0

various Semi-Precious Gems

Calcite Satin Spar

Hardness: 3.0

various Collector Gems

Caledonite

Hardness: 2.5

various Semi-Precious Gems

Californite

Hardness: 6.5

various Semi-Precious Gems

Cancrinite

Hardness: 5.0

various Semi-Precious Gems

Carletonite

Hardness: 4.0

red Semi-Precious Gems

Carnelian

Hardness: 6.5

various Semi-Precious Gems

Cassiterite

Hardness: 6.0

various Semi-Precious Gems

Catapleiite

Hardness: 5.0

various Semi-Precious Gems

Celestine

Hardness: 3.0

various Semi-Precious Gems

Cerussite

Hardness: 3.0

various Semi-Precious Gems

Ceylonite

Hardness: 7.5

various Semi-Precious Gems

Chabazite

Hardness: 4.5

various Semi-Precious Gems

Chalcedony

Hardness: 6.5

various Semi-Precious Gems

Chalcopyrite

Hardness: 3.5

various Organic Gems

Chambersite

Hardness: 7.0

various Semi-Precious Gems

Charoite

Hardness: 5.0

various Semi-Precious Gems

Chiastolite

Hardness: 5.0

various Semi-Precious Gems

Childrenite

Hardness: 4.5

various Semi-Precious Gems

Chlorapatite

Hardness: 5.0

various Semi-Precious Gems

Chlorastrolite

Hardness: 5.0

various Semi-Precious Gems

Chondrodite

Hardness: 6.0

various Semi-Precious Gems

Chrome-Chalcedony

Hardness: 6.5

various Semi-Precious Gems

Chrome-Diopside

Hardness: 5.0

various Semi-Precious Gems

Chrome Pyrope

Hardness: 7.0

various Semi-Precious Gems

Chrome-Tourmaline

Hardness: 7.0

various Semi-Precious Gems

Chrome-Tremolite

Hardness: 5.0

various Semi-Precious Gems

Chrysoberyl

Hardness: 8.5

various Collector Gems

Chrysocolla

Hardness: 2.0

various Semi-Precious Gems

Chrysoprase

Hardness: 6.5

various Collector Gems

Chrysotile

Hardness: 2.5

various Collector Gems

Cinnabar

Hardness: 2.0

yellow Semi-Precious Gems

Citrine

Hardness: 7.0

various Collector Gems

Clinochlore

Hardness: 2.0

various Semi-Precious Gems

Clinohedrite

Hardness: 5.5

various Semi-Precious Gems

Clinohumite

Hardness: 6.0

various Semi-Precious Gems

Clinozoisite

Hardness: 6.0

various Semi-Precious Gems

Cobaltite

Hardness: 5.5

various Semi-Precious Gems

Colemanite

Hardness: 4.5

white Semi-Precious Gems

Common Opal

Hardness: 5.5

white Organic Gems

Copal

Hardness: 2.0

various Organic Gems

Coral

Hardness: 3.0

various Semi-Precious Gems

Cordierite (Iolite)

Hardness: 7.0

various Semi-Precious Gems

Corundum

Hardness: 9.0

various Collector Gems

Covellite

Hardness: 1.5

various Semi-Precious Gems

Creedite

Hardness: 4.5

various Semi-Precious Gems

Cristinite

Hardness: 6.5

various Collector Gems

Crocoite

Hardness: 2.5

various Collector Gems

Cryolite

Hardness: 2.5

white Semi-Precious Gems

Crystal Opal

Hardness: 5.5

various Semi-Precious Gems

Cubic Zirconia

Hardness: 8.5

various Semi-Precious Gems

Cuprite

Hardness: 3.5

various Semi-Precious Gems

Cymophane

Hardness: 8.5

various Semi-Precious Gems

Cyprine (of Berzelius)

Hardness: 6.0

various Semi-Precious Gems

Dallasite

Hardness: 6.5

various Semi-Precious Gems

Danburite

Hardness: 7.0

various Semi-Precious Gems

Datolite

Hardness: 5.0

various Semi-Precious Gems

Demantoid

Hardness: 6.5

various Precious Gems

Diamond

Hardness: 10.0

various Semi-Precious Gems

Diaspore

Hardness: 6.5

various Semi-Precious Gems

Diopside

Hardness: 5.0

various Semi-Precious Gems

Dioptase

Hardness: 5.0

various Semi-Precious Gems

Dolomite

Hardness: 3.5

various Semi-Precious Gems

Dravite

Hardness: 7.0

various Semi-Precious Gems

Dumortierite

Hardness: 7.0

various Semi-Precious Gems

Ekanite

Hardness: 6.0

various Semi-Precious Gems

Elaeolite

Hardness: 5.5

various Semi-Precious Gems

Elbaite

Hardness: 7.0

green Precious Gems

Emerald

Hardness: 7.5

various Semi-Precious Gems

Enstatite

Hardness: 5.5

various Semi-Precious Gems

Eosphorite

Hardness: 5.0

various Semi-Precious Gems

Epidote

Hardness: 6.0

various Semi-Precious Gems

Esperite

Hardness: 5.0

various Collector Gems

Ettringite

Hardness: 2.0

various Semi-Precious Gems

Euclase

Hardness: 7.5

various Semi-Precious Gems

Eudialyte

Hardness: 5.0

various Semi-Precious Gems

Falcon's Eye

Hardness: 7.0

various Semi-Precious Gems

Faustite

Hardness: 4.5

various Semi-Precious Gems

Fayalite

Hardness: 6.5

various Semi-Precious Gems

Feldspar

Hardness: 6.0

various Semi-Precious Gems

Ferro-axinite (Axinite-(Fe))

Hardness: 6.5

various Semi-Precious Gems

Fibrolite

Hardness: 6.0

various Semi-Precious Gems

Fire Agate

Hardness: 6.5

white Semi-Precious Gems

Fire Opal

Hardness: 6.0

various Semi-Precious Gems

Fluorapatite

Hardness: 5.0

various Semi-Precious Gems

Fluor-buergerite

Hardness: 7.0

various Semi-Precious Gems

Fluorite

Hardness: 4.0

various Semi-Precious Gems

Fluor-uvite-Uvite Series

Hardness: 7.5

various Semi-Precious Gems

Foitite

Hardness: 7.0

various Semi-Precious Gems

Forsterite

Hardness: 6.5

various Semi-Precious Gems

Franklinite

Hardness: 6.0

various Semi-Precious Gems

Friedelite

Hardness: 4.0

various Collector Gems

Fuchsite

Hardness: 2.5

red Semi-Precious Gems

Gadolinium Gallium Garnet (GGG)

Hardness: 6.5

various Semi-Precious Gems

Gahnite

Hardness: 7.5

various Semi-Precious Gems

Gahnospinel

Hardness: 7.5

red Semi-Precious Gems

Garnet Group

Hardness: 6.5

various Semi-Precious Gems

Gaspéite

Hardness: 4.5

various Semi-Precious Gems

Gedrite

Hardness: 5.5

various Semi-Precious Gems

Girasol

Hardness: 5.5

various Semi-Precious Gems

Glass

Hardness: 4.0

various Semi-Precious Gems

Goethite

Hardness: 5.0

various Semi-Precious Gems

Goldstone

Hardness: 6.0

various Semi-Precious Gems

Goshenite

Hardness: 7.5

various Semi-Precious Gems

Grandidierite

Hardness: 7.5

various Semi-Precious Gems

Grossular

Hardness: 7.0

various Collector Gems

Gypsum

Hardness: 2.0

various Semi-Precious Gems

Hackmanite

Hardness: 5.5

various Organic Gems

Hambergite

Hardness: 7.5

various Semi-Precious Gems

Hardystonite

Hardness: 3.0

white Semi-Precious Gems

Harlequin Opal

Hardness: 5.5

various Semi-Precious Gems

Haüyne

Hardness: 5.5

various Semi-Precious Gems

Heliodor (Golden Beryl)

Hardness: 7.5

various Semi-Precious Gems

Hematite

Hardness: 6.0

various Semi-Precious Gems

Hemimorphite

Hardness: 5.0

various Semi-Precious Gems

Hercynite

Hardness: 7.5

various Semi-Precious Gems

Herderite

Hardness: 5.0

various Semi-Precious Gems

Hessonite

Hardness: 7.0

various Semi-Precious Gems

Hexagonite

Hardness: 5.0

various Semi-Precious Gems

Hibonite

Hardness: 7.5

various Semi-Precious Gems

Hibschite

Hardness: 6.0

various Semi-Precious Gems

Hiddenite

Hardness: 6.0

various Semi-Precious Gems

Hodgkinsonite

Hardness: 4.5

various Semi-Precious Gems

Holmquistite

Hardness: 5.0

white Semi-Precious Gems

Honey Opal

Hardness: 5.5

various Semi-Precious Gems

Howlite

Hardness: 3.0

various Semi-Precious Gems

Hübnerite

Hardness: 4.0

various Semi-Precious Gems

Humite

Hardness: 6.0

various Semi-Precious Gems

Hureaulite

Hardness: 3.5

various Semi-Precious Gems

Hurlbutite

Hardness: 6.0

various Semi-Precious Gems

Hyacinth

Hardness: 6.5

various Semi-Precious Gems

Hyalite

Hardness: 5.5

various Semi-Precious Gems

Hydrogrossular

Hardness: 7.5

various Semi-Precious Gems

Hydrophane

Hardness: 5.5

various Semi-Precious Gems

Hypersthene

Hardness: 5.0

yellow Semi-Precious Gems

Imperial Topaz (A variety of topaz of orange, pinkish colours.)

Hardness: 8.0

various Collector Gems

Inderite

Hardness: 2.5

various Semi-Precious Gems

Indicolite (Blue Tourmaline)

Hardness: 7.0

various Semi-Precious Gems

Iris Agate

Hardness: 6.5

various Organic Gems

Ivory

Hardness: 2.0

various Semi-Precious Gems

Jacobsite

Hardness: 5.5

green Semi-Precious Gems

Jade

Hardness: 6.0

green Semi-Precious Gems

Jadeite

Hardness: 6.5

various Semi-Precious Gems

Jasper

Hardness: 6.5

various Semi-Precious Gems

Jeremejevite

Hardness: 6.5

various Organic Gems

Jet

Hardness: 2.5

various Semi-Precious Gems

Johachidolite

Hardness: 7.5

various Collector Gems

Kämmererite

Hardness: 2.0

various Semi-Precious Gems

Kornerupine

Hardness: 6.5

various Semi-Precious Gems

Kunzite

Hardness: 6.0

various Semi-Precious Gems

Kyanite (Cyprine)

Hardness: 4.0

various Semi-Precious Gems

Labradorite

Hardness: 6.0

blue Semi-Precious Gems

Lapis lazuli

Hardness: 5.5

various Semi-Precious Gems

Larimar

Hardness: 5.0

various Semi-Precious Gems

Larvikite

Hardness: 6.0

various Semi-Precious Gems

Lazulite

Hardness: 5.5

various Semi-Precious Gems

Lazurite

Hardness: 5.5

various Semi-Precious Gems

Legrandite

Hardness: 4.5

various Collector Gems

Lepidolite

Hardness: 2.5

various Semi-Precious Gems

Leucite

Hardness: 5.5

various Semi-Precious Gems

Libyan Desert Glass

Hardness: 0.0

various Semi-Precious Gems

Liddicoatite

Hardness: 7.5

various Collector Gems

Linarite

Hardness: 2.5

various Collector Gems

Lizardite

Hardness: 2.5

various Semi-Precious Gems

Londonite

Hardness: 8.0

various Semi-Precious Gems

Ludlamite

Hardness: 3.0

various Semi-Precious Gems

Magnesio-axinite (Axinite-(Mg))

Hardness: 6.5

various Semi-Precious Gems

Magnesite

Hardness: 3.5

various Semi-Precious Gems

Magnetite

Hardness: 5.5

green Semi-Precious Gems

Malachite

Hardness: 3.5

various Semi-Precious Gems

Manganaxinite (Axinite-(Mn))

Hardness: 6.5

various Semi-Precious Gems

Manganotantalite

Hardness: 5.5

various Semi-Precious Gems

Marcasite

Hardness: 6.0

various Semi-Precious Gems

Marialite

Hardness: 5.5

white Semi-Precious Gems

Matrix Opal

Hardness: 5.5

various Semi-Precious Gems

Maw Sit Sit

Hardness: 6.0

various Semi-Precious Gems

Meionite

Hardness: 5.0

various Semi-Precious Gems

Melanite

Hardness: 6.5

various Organic Gems

Mellite

Hardness: 2.0

various Semi-Precious Gems

Microcline

Hardness: 6.0

various Semi-Precious Gems

Microlite

Hardness: 5.0

various Semi-Precious Gems

Milarite

Hardness: 5.5

white Semi-Precious Gems

Milk Opal (Porcelain Opal)

Hardness: 5.5

various Semi-Precious Gems

Mimetite

Hardness: 3.5

various Semi-Precious Gems

Mohawkite

Hardness: 3.0

various Semi-Precious Gems

Moissanite

Hardness: 9.0

various Semi-Precious Gems

Moldavite

Hardness: 5.5

various Semi-Precious Gems

Monazite

Hardness: 5.0

various Semi-Precious Gems

Montebrasite

Hardness: 5.5

white Semi-Precious Gems

Moonstone

Hardness: 6.0

various Semi-Precious Gems

Morganite

Hardness: 7.5

various Semi-Precious Gems

Morion

Hardness: 7.0

various Semi-Precious Gems

Moroxite

Hardness: 5.0

various Semi-Precious Gems

Moss Agate

Hardness: 6.5

white Semi-Precious Gems

Moss Opal

Hardness: 5.5

various Organic Gems

Mother of Pearl

Hardness: 2.5

various Collector Gems

Muscovite

Hardness: 2.0

various Semi-Precious Gems

Musgravite

Hardness: 0.0

various Precious Gems

Nano-Polycrystalline Diamond

Hardness: 0.0

various Semi-Precious Gems

Narsarsukite

Hardness: 6.0

various Semi-Precious Gems

Natrolite

Hardness: 5.0

various Semi-Precious Gems

Nepheline

Hardness: 5.0

various Semi-Precious Gems

Nephrite

Hardness: 6.0

various Semi-Precious Gems

Neptunite

Hardness: 5.0

various Semi-Precious Gems

Nifontovite

Hardness: 3.5

various Semi-Precious Gems

Norbergite

Hardness: 6.0

various Semi-Precious Gems

Nosean

Hardness: 5.5

various Semi-Precious Gems

Nuummite

Hardness: 5.5

black Semi-Precious Gems

Obsidian

Hardness: 5.0

various Semi-Precious Gems

Odontolite

Hardness: 5.0

various Semi-Precious Gems

Oligoclase

Hardness: 6.0

various Semi-Precious Gems

Omphacite

Hardness: 5.0

black Semi-Precious Gems

Onyx

Hardness: 6.5

white Semi-Precious Gems

Opal

Hardness: 5.0

various Semi-Precious Gems

Orthoclase

Hardness: 6.0

various Semi-Precious Gems

Padparadscha

Hardness: 9.0

various Semi-Precious Gems

Painite

Hardness: 7.5

various Semi-Precious Gems

Papagoite

Hardness: 5.0

various Semi-Precious Gems

Paraíba Tourmaline (Cuprian Elbaite)

Hardness: 7.0

various Semi-Precious Gems

Pargasite

Hardness: 5.0

various Semi-Precious Gems

Parisite

Hardness: 4.5

various Organic Gems

Pearl

Hardness: 2.5

various Semi-Precious Gems

Pectolite

Hardness: 4.5

various Semi-Precious Gems

Periclase

Hardness: 5.5

green Semi-Precious Gems

Peridot (Olivine)

Hardness: 6.5

various Semi-Precious Gems

Petalite

Hardness: 6.0

various Semi-Precious Gems

Petrified Wood (Fossilized Wood)

Hardness: 6.5

various Semi-Precious Gems

Pezzottaite

Hardness: 7.5

various Semi-Precious Gems

Phenakite

Hardness: 7.5

various Collector Gems

Phosgenite

Hardness: 2.0

various Semi-Precious Gems

Phosphophyllite

Hardness: 3.0

various Semi-Precious Gems

Phosphosiderite

Hardness: 3.5

white Semi-Precious Gems

Pink Opal

Hardness: 6.0

various Semi-Precious Gems

Pleonaste

Hardness: 8.0

various Semi-Precious Gems

Pollucite

Hardness: 6.5

various Semi-Precious Gems

Poudretteite

Hardness: 5.0

various Semi-Precious Gems

Povondraite

Hardness: 7.0

various Semi-Precious Gems

Powellite

Hardness: 3.5

various Semi-Precious Gems

Prase

Hardness: 7.0

white Semi-Precious Gems

Prase Opal

Hardness: 5.0

various Semi-Precious Gems

Prasiolite

Hardness: 7.0

white Semi-Precious Gems

Precious Opal

Hardness: 5.0

various Semi-Precious Gems

Prehnite

Hardness: 6.0

various Collector Gems

Proustite

Hardness: 2.5

various Semi-Precious Gems

Pumpellyite Subgroup

Hardness: 5.0

various Semi-Precious Gems

Purpurite

Hardness: 4.0

various Collector Gems

Pyrargyrite

Hardness: 2.5

various Semi-Precious Gems

Pyrite

Hardness: 6.0

various Semi-Precious Gems

Pyromorphite

Hardness: 3.5

various Semi-Precious Gems

Pyrope

Hardness: 7.0

various Semi-Precious Gems

Pyrope-Spessartine

Hardness: 7.0

various Collector Gems

Pyrophyllite

Hardness: 1.0

various Semi-Precious Gems

Pyroxmangite

Hardness: 5.0

various Semi-Precious Gems

Quartz

Hardness: 7.0

various Collector Gems

Realgar

Hardness: 1.5

various Semi-Precious Gems

Red Beryl (Bixbite)

Hardness: 7.5

various Semi-Precious Gems

Rhodizite

Hardness: 8.0

pink Semi-Precious Gems

Rhodochrosite (Manganesespar)

Hardness: 4.0

various Semi-Precious Gems

Rhodolite

Hardness: 7.0

pink Semi-Precious Gems

Rhodonite

Hardness: 5.5

various Semi-Precious Gems

Riesling Beryl

Hardness: 7.5

various Semi-Precious Gems

Rinkite-(Ce)

Hardness: 5.0

various Semi-Precious Gems

Rock Crystal

Hardness: 7.0

various Semi-Precious Gems

Romanèchite

Hardness: 5.0

various Semi-Precious Gems

Rose Quartz

Hardness: 7.0

various Semi-Precious Gems

Rossmanite

Hardness: 7.0

various Semi-Precious Gems

Rubellite

Hardness: 7.0

red Precious Gems

Ruby

Hardness: 9.0

various Semi-Precious Gems

Rutilated Quartz

Hardness: 7.0

various Semi-Precious Gems

Rutile

Hardness: 6.0

various Semi-Precious Gems

Sanidine

Hardness: 6.0

blue Precious Gems

Sapphire

Hardness: 9.0

various Semi-Precious Gems

Sapphirine

Hardness: 7.5

various Semi-Precious Gems

Sarcopside

Hardness: 4.0

various Semi-Precious Gems

Sard

Hardness: 6.5

black Semi-Precious Gems

Sardonyx

Hardness: 6.5

various Collector Gems

Satin Spar

Hardness: 2.0

various Semi-Precious Gems

Scapolite

Hardness: 5.5

various Semi-Precious Gems

Scheelite

Hardness: 4.5

various Semi-Precious Gems

Schorl

Hardness: 7.0

various Semi-Precious Gems

Schorlomite

Hardness: 7.0

various Collector Gems

Schultenite

Hardness: 2.5

various Semi-Precious Gems

Scolecite

Hardness: 5.0

various Semi-Precious Gems

Scorzalite

Hardness: 5.5

various Collector Gems

Selenite

Hardness: 2.0

various Semi-Precious Gems

Sellaite

Hardness: 5.0

various Semi-Precious Gems

Serandite

Hardness: 5.0

various Semi-Precious Gems

Seraphinite

Hardness: 0.0

various Semi-Precious Gems

Serendibite

Hardness: 6.5

various Collector Gems

Serpentine

Hardness: 2.5

various Semi-Precious Gems

Shattuckite

Hardness: 3.5

black Semi-Precious Gems

Sheen Obsidian

Hardness: 5.0

various Semi-Precious Gems

Shortite

Hardness: 3.0

various Semi-Precious Gems

Siderite

Hardness: 3.5

various Semi-Precious Gems

Sillimanite

Hardness: 6.0

various Semi-Precious Gems

Simpsonite

Hardness: 7.0

various Semi-Precious Gems

Sinhalite

Hardness: 6.0

various Semi-Precious Gems

Smaragdite

Hardness: 5.5

various Semi-Precious Gems

Smithsonite

Hardness: 5.0

various Semi-Precious Gems

Smoky Quartz

Hardness: 7.0

black Semi-Precious Gems

Snowflake Obsidian

Hardness: 5.0

various Semi-Precious Gems

Sodalite

Hardness: 5.0

various Semi-Precious Gems

Sogdianite

Hardness: 7.0

various Semi-Precious Gems

Sonolite

Hardness: 5.5

various Semi-Precious Gems

Spessartine

Hardness: 7.0

various Semi-Precious Gems

Sphalerite

Hardness: 3.5

various Semi-Precious Gems

Spinel

Hardness: 8.0

various Semi-Precious Gems

Spodumene

Hardness: 6.0

various Semi-Precious Gems

Starlite

Hardness: 6.5

red Precious Gems

Star Ruby

Hardness: 9.0

blue Precious Gems

Star Sapphire

Hardness: 9.0

various Semi-Precious Gems

Staurolite

Hardness: 7.0

various Collector Gems

Steatite

Hardness: 1.0

various Semi-Precious Gems

Stibiotantalite

Hardness: 5.5

various Collector Gems

Stichtite

Hardness: 1.5

various Semi-Precious Gems

Strontianite

Hardness: 3.5

various Semi-Precious Gems

Strontium Titanate

Hardness: 5.5

various Semi-Precious Gems

Sugilite

Hardness: 5.5

various Collector Gems

Sulphur

Hardness: 1.5

various Semi-Precious Gems

Sunstone (Aventurine feldspar)

Hardness: 6.0

various Semi-Precious Gems

Sussexite

Hardness: 3.0

various Semi-Precious Gems

Taaffeite (Magnesiotaaffeite)

Hardness: 8.0

various Collector Gems

Talc

Hardness: 1.0

various Semi-Precious Gems

Tantalite

Hardness: 6.0

various Semi-Precious Gems

Tanzanite

Hardness: 6.5

various Semi-Precious Gems

Tavorite

Hardness: 0.0

various Semi-Precious Gems

Tektite

Hardness: 5.5

various Semi-Precious Gems

Thaumasite

Hardness: 3.5

various Semi-Precious Gems

Thomsonite Subgroup

Hardness: 5.0

various Semi-Precious Gems

Thulite

Hardness: 6.0

various Semi-Precious Gems

Tiger's Eye

Hardness: 6.5

various Semi-Precious Gems

Tinzenite

Hardness: 6.5

various Semi-Precious Gems

Titanite (Sphene)

Hardness: 5.0

yellow Semi-Precious Gems

Topaz

Hardness: 8.0

yellow Semi-Precious Gems

Topazolite

Hardness: 6.5

various Organic Gems

Tortoiseshell

Hardness: 3.0

various Semi-Precious Gems

Tourmaline

Hardness: 7.0

green Semi-Precious Gems

Transvaal Jade

Hardness: 7.0

various Semi-Precious Gems

Tremolite

Hardness: 5.0

various Semi-Precious Gems

Triplite

Hardness: 5.0

various Semi-Precious Gems

Tsavorite

Hardness: 7.0

various Semi-Precious Gems

Tugtupite

Hardness: 5.5

blue Semi-Precious Gems

Turquoise

Hardness: 5.0

various Collector Gems

Ulexite

Hardness: 2.0

various Semi-Precious Gems

Umbalite

Hardness: 7.0

various Semi-Precious Gems

Unakite

Hardness: 6.0

various Semi-Precious Gems

Uvarovite

Hardness: 7.5

various Semi-Precious Gems

Variscite

Hardness: 4.0

various Semi-Precious Gems

Verdelite

Hardness: 7.0

various Semi-Precious Gems

Verdite

Hardness: 3.0

various Semi-Precious Gems

Vesuvianite (Idocrase)

Hardness: 6.5

various Collector Gems

Villiaumite

Hardness: 2.0

various Semi-Precious Gems

Violane

Hardness: 5.0

various Semi-Precious Gems

Viridine

Hardness: 7.0

various Collector Gems

Vivianite

Hardness: 1.5

various Semi-Precious Gems

Wardite

Hardness: 4.5

various Semi-Precious Gems

Watermelon Tourmaline

Hardness: 7.0

white Semi-Precious Gems

Water Opal (Jelly Opal)

Hardness: 5.5

various Semi-Precious Gems

Wavellite

Hardness: 3.5

white Semi-Precious Gems

Wax Opal

Hardness: 5.5

various Semi-Precious Gems

Wernerite

Hardness: 5.0

white Semi-Precious Gems

White Opal

Hardness: 5.5

various Semi-Precious Gems

Whitlockite

Hardness: 5.0

various Semi-Precious Gems

Willemite

Hardness: 5.5

various Semi-Precious Gems

Williamsite

Hardness: 4.0

various Semi-Precious Gems

Witherite

Hardness: 3.0

white Semi-Precious Gems

Wood Opal

Hardness: 5.5

various Semi-Precious Gems

Wulfenite

Hardness: 3.0

various Semi-Precious Gems

Xenotime

Hardness: 4.0

various Semi-Precious Gems

Xonotlite

Hardness: 6.0

red Semi-Precious Gems

Yttrium Aluminium Garnet

Hardness: 8.0

various Semi-Precious Gems

Zektzerite

Hardness: 6.0

various Semi-Precious Gems

Zincite

Hardness: 4.0

various Semi-Precious Gems

Zircon

Hardness: 7.5

various Semi-Precious Gems

Zoisite

Hardness: 6.0