Ivory
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Physical & Optical Properties
Category
Organic Gems
Mohs Hardness
2.0 – 3.0
Specific Gravity
1.7 – 2.0
Refractive Index
1.535 – 1.57
Crystal System
Amorphous
Cleavage
None
Color
various
Pleochroism
None
Mohs Hardness
| Mohs | Reference mineral | Ivory |
|---|---|---|
| 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 Ivory
Links may earn a commission at no extra cost to you.
Treatments
Heated or dyed with tea to darken the color - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
Ivory has been imitated by many look-alike materials that include glass, plastic, bone and vegetable ivory. - Michael O�Donoghue, Gems, Sixth edition, 2006, p.665
2 to 3Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
1.70 to 2.00Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
NoneWalter Schumann, Gemstones of the world (2001)
1.535 to 1.570Walter Schumann, Gemstones of the world (2001) More from other references
NoneWalter Schumann, Gemstones of the world (2001)
NoneWalter Schumann, Gemstones of the world (2001)
NoneWalter Schumann, Gemstones of the world (2001)
White, creamyWalter Schumann, Gemstones of the world (2001) More from other references
Translucent,OpaqueWalter Schumann, Gemstones of the world (2001) More from other references
Most ivory: bluish white to violet blue (SW weaker)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Violet-blueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
AmorphousHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Ivory information at mindat.org
About Ivory
アイボリー（象牙）は、象・マンモス・セイウチ・カバなどの歯や牙からなる有機質宝石材料です。白色から淡黄色の特徴的な外観と「シュレーガー紋」と呼ばれる格子状の組織で識別されます。現在は多くの国でゾウの象牙取引が禁止されており、マンモス象牙や代替材料が使用されています。
On this page
Jewelry Use
Durability
1/10
Science FYI Family
Frequently Asked Questions
What is Ivory?
アイボリー（象牙）は、象・マンモス・セイウチ・カバなどの歯や牙からなる有機質宝石材料です。白色から淡黄色の特徴的な外観と「シュレーガー紋」と呼ばれる格子状の組織で識別されます。現在は多くの国でゾウの象牙取引が禁止されており、マンモス象牙や代替材料が使用されています。
What is the hardness of Ivory?
Ivory has a Mohs hardness of 2.0 to 3.0, making it relatively soft for use in jewelry.
What color is Ivory?
Ivory is primarily Various.
How much does Ivory cost?
Ivory falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Ivory?
Ivory belongs to the Amorphous crystal system.