Zentron Crystal Collection Rough Ruby Stones - Large Pieces in Velvet Bag (1 Pound)

Ruby is a variety of the mineral corundum. In its pure form it is red in color while impurities in the stone can make it blue, orange yellow, green or purple. In the blue form the stone is known as a sapphire while all the other colors are fancy sapphires. Rubies red color comes from it mineral content of Chromium. The more in the stone the darker the red. Ruby is the birthstone of July. It is very hard stone with a mohs of 9.0 making it one of the hardess gems known.