Ruby is one of the most popular jewelry stones. Fine-quality rubies are some of the most expensive gemstones. However, rubies are also subjected to more treatments than almost any other gem. For this reason, ruby prices can range from a few hundred dollars a carat to thousands of dollars per carat.

• Color: red, orange-red, purplish red, pinkish-red

• Crystal structure: trigonal

• Luster: subadamantine, vitreous

• Transparency: transparent to translucent

• Refractive index: 1.757-1.779

• Specific Gravity: 3.95 – 4.10

• Cleavage: none

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