Up until the end of the 19th century yellow sapphire was known as ÔÇťoriental topaz” (only blue corundum was called sapphire). Nevertheless, yellow and greenish yellow sapphires make unusual and attractive gemstones in their own right

In Queensland and New South Wales(Australia), a greenish yellow sapphire is found that may be faceted. Similar stones occur in Thailand, and purely yellow stones in Sri Lanka, Montana(USA), and East Africa.

Crystal Structure Trigonal
Composition Aluminum Oxide
Hardness 9
Specific Gravity 4
Refractive Index 1.76-1.77
DR 0.008
Luster Vitreous