Yellow Sapphire (Corundum)

Yellow sapphire was known as ‘oriental topaz’ up until the 19^th century (only blue corundum was called blue sapphire). Nonetheless, yellow sapphire makes an unusual and attractive gemstone. Rough yellow sapphire crystals are found in barrel-shape with tapering ends.

Occurrence

Yellow sapphire occurs in Queensland and New South Wales (Australia). A greenish yellow sapphire is also found that may be faceted. Similar stones are found in Thailand. However, the best quality yellow sapphire is mined in Sri Lanka. Other sources include Montana (USA) and East Africa.

Yellow Sapphire Properties

• Specific Gravity: 4.00
• Refractive Index: 1.76-1.77
• Birefringence (DR): 0.008
• Luster: Vitreous
• Crystal Structure: Trigonal
• Composition: Aluminum Oxide
• Hardness: 9

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