Glass
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
4.0 – 6.0
Specific Gravity
2.39 – 4.0
Refractive Index
1.48 – 1.7
Crystal System
Amorphous
Luster
Vitreous
Fracture
Conchoidal
Color
various
Mohs Hardness
| Mohs | Reference mineral | Glass |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | ● |
| 5 | Apatite | ● |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Glass
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
Treatments
Can be coated with metal foils - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 2
4 to 6Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
2.39 to 4.00Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
ConchoidalGemdat.org, Management Team (2012)
1.48 to 1.70Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
IsotropicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Various, play of colourUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
Yellowish green, Fe2+ in octahedral coordination. Brown Fe3+ in octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
VitreousGemdat.org, Management Team (2012)
Strong chalky fluorescence commonHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
AmorphousHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Gas bubbles, swirl marks, partly tabby extinction - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 2
Glass information at mindat.org
About Glass
宝石用ガラスは、天然の火山ガラス（黒曜石・モルダバイトなど）と人工ガラスに分類されます。パステルやストラスなどの人工模擬宝石として古くから使用されてきました。宝石鑑別においては天然石との区別が重要で、気泡・旋回線・コンコイダル破口などが人工ガラスの特徴です。
On this page
Jewelry Use
Durability
3/10
Science FYI Family
Frequently Asked Questions
What is Glass?
宝石用ガラスは、天然の火山ガラス（黒曜石・モルダバイトなど）と人工ガラスに分類されます。パステルやストラスなどの人工模擬宝石として古くから使用されてきました。宝石鑑別においては天然石との区別が重要で、気泡・旋回線・コンコイダル破口などが人工ガラスの特徴です。
What is the hardness of Glass?
Glass has a Mohs hardness of 4.0 to 6.0, making it relatively soft for use in jewelry.
What color is Glass?
Glass is primarily Various.
How much does Glass cost?
Glass falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Glass?
Glass belongs to the Amorphous crystal system.