Ruby

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Ruby is the red variety of corundum, colored by chromium, and stands among the four precious gemstones alongside diamond, emerald, and sapphire; the finest examples command higher per-carat prices than any other gem. The most prized stones, described by the trade as pigeon's blood red, come from the Mogok Valley of Myanmar, which has been mined for over 2,500 years, with additional fine material from Mozambique, Thailand, and Sri Lanka. A Mohs hardness of 9 and outstanding durability make ruby ideal for everyday jewelry. In many Asian cultures the stone symbolizes power, passion, and protection, and it serves as the birthstone for July.

Physical & Optical Properties

Category Precious Gems
Mohs Hardness 9.0
Specific Gravity 3.97 – 4.05
Refractive Index 1.762 – 1.778
Crystal System Trigonal
Cleavage None
Color red
Birefringence 0.008
Dispersion 0.018
Pleochroism Strong: purplish-red - orangy-red

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Ruby
Mohs hardness of Ruby shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Ruby
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Investment ($5,000+/ct)

Cultural Significance

Birthstone Month 7 (modern)

About Ruby

红宝石是刚玉的红色品种,由铬元素着色,与钻石、祖母绿和蓝宝石并列为四大珍贵宝石,品质最佳的红宝石每克拉价格超过其他任何宝石。最珍贵的红宝石被称为"鸽血红",产自缅甸抹谷山谷,已有逾2500年的开采历史,莫桑比克、泰国和斯里兰卡也出产优质红宝石。在众多亚洲文化中,红宝石象征权力、激情与保护。

Science FYI Family

Frequently Asked Questions

What is Ruby?
红宝石是刚玉的红色品种,由铬元素着色,与钻石、祖母绿和蓝宝石并列为四大珍贵宝石,品质最佳的红宝石每克拉价格超过其他任何宝石。最珍贵的红宝石被称为"鸽血红",产自缅甸抹谷山谷,已有逾2500年的开采历史,莫桑比克、泰国和斯里兰卡也出产优质红宝石。在众多亚洲文化中,红宝石象征权力、激情与保护。
What is the hardness of Ruby?
Ruby has a Mohs hardness of 9.0, making it excellent for use in jewelry.
What color is Ruby?
Ruby is primarily Red.
Where is Ruby found?
Ruby is found in Jegdalek (Afghanistan), Mogok (Myanmar), Sri Lanka (Ceylon) (Sri Lanka), Ratnapura (Sri Lanka), Luc Yen (Vietnam).
How much does Ruby cost?
Ruby falls into the Investment ($5,000+/ct) price range. Prices vary based on color, clarity, cut, and origin.

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