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
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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
象牙是大象、猛犸象等动物的牙本质材料，由含有机质的磷灰石组成，呈乳白色至浅黄色，质地细腻温润，具有独特的同心圆纹（韦氏纹）。象牙在人类历史上被广泛用于雕刻艺术品、珠宝首饰和工艺品，具有重要的文化和历史价值。由于国际贸易公约（CITES）对象牙贸易的严格管控，现代商业象牙的使用受到极大限制，目前市场上主要流通古董象牙或替代材料。
On this page
Jewelry Use
Durability
1/10
Science FYI Family
Frequently Asked Questions
What is Ivory?
象牙是大象、猛犸象等动物的牙本质材料，由含有机质的磷灰石组成，呈乳白色至浅黄色，质地细腻温润，具有独特的同心圆纹（韦氏纹）。象牙在人类历史上被广泛用于雕刻艺术品、珠宝首饰和工艺品，具有重要的文化和历史价值。由于国际贸易公约（CITES）对象牙贸易的严格管控，现代商业象牙的使用受到极大限制，目前市场上主要流通古董象牙或替代材料。
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.