The name "Sapphire" is derived from Greek (= blue). The term used to indicate a number of gemstones. Only around 1800 it was discovered that ruby and sapphire both belonged to the group corundum. From this point on "sapphire" was used to describe the blue variety of corundum. Other colors got rather confusing names that are no longer used today : "Orient peridote" = green sapphire "Orient topaz" = yellow sapphire. Yellow Sapphire a gem of the corundum family and is a twin of ruby and blue sapphire. It is available in yellow, golden and orange colours. The colour in yellow sapphire is of iron and titanium. In Vedic Astrology, it is worn for planet jupiter (बृहस्पति). knowledge of the law, ethics, wit, wisdom, worldly happiness, cleverness, long life, and mental peace, intelligence. • Group: Corundum • Refractive index: 1.762-1.770 • Birefringence: 0.008-0.010 • Specific gravity: 4.00/ +0.10, -0.05 • Crystal system: Trigonal • Hardness: 9 • Comments: Silk, Finger prints inclusions • Origin: Sri lanka(Ceylon) Note- This range of this gemstone may contain natural inclusions like flaw, spot, or scratch on the surface of a gemstone.