Yellow Sapphire Gemstone Information Information * Loose gemstones * Jewelry links Yellow Sapphire ranges in color from pale to canary yellow, gold, honey, and brownish yellow. The lighter and brighter colors are the most common. View examples of cut yellow sapphire below and prices in our store section.   ENHANCEMENT CODE H Click to view AGTA code. PROPERTIES Refractive Index 1.762-1.77 Hardness = 9 (Moh's Scale) Specific Gravity =4.0 Species - Corundum Optic Character - Double Refraction. Phenomena - Chatoyancy (Very Rare) WARNINGS FOR CARE Ultrasonic: Usually Safe Steamer: Usually Safe Heat: Poor; may sometimes Improve color, but may cause loss of color Chemicals that harm: Borax   Crystal Structure Crystal system: Hexagonal (trigonal), dipyramidal, barrel and tabloid shape. MAJOR SOURCES Australia, Thailand, Sri Lanka, Myanmar, India, Kampuchea, Kenya, Tanzania, US, Madagascar Birthstones  January  Garnet February Amethyst March Aquamarine April Diamond May Emerald June Pearl/Alexandrite July Ruby August Peridot September Sapphire October Opal/Tourmaline November Topaz or Citrine December Blue Topaz or Zircon Brilliant cut. Princess cut. Oval shape.

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