Rough Ruby Corundum Hexagon Crystals / 20-30mm AVG - 1 LB. LOT

Quantity: 1 pound

Average size range: 20 to 30 millimeters

Rubies are one of two varieties of the aluminum oxide mineral corundum. Rarer than sapphire, ruby corundum contains large amounts of chromium in its crystalline structure. Ruby is considered one of the traditional “Big 4” gemstones along with diamonds, emeralds, and sapphires, and has been used in jewelry and carvings for thousands of years.