Black Star & Blue Star Sapphire Gemstone Information. Information * Loose gemstones * Jewelry links The three crossbars of star sapphire represent faith, hope, and charity. It was once used to ward off bad omens and the evil eye. Star Sapphire was considered so potent that its influence would remain with the first owner, even after it was passed on into other hands. View examples of blue & black star sapphire below and prices in our store.   ENHANCEMENT CODE N Click to view AGTA code. PROPERTIES Refractive Index 1.762-1.770 Hardness = 9 (Moh's Scale) Specific Gravity =4.0 Species - Corundum Optic Character - Double Refraction. Phenomena - Asterism WARNINGS FOR CARE Ultrasonic: Risky Steamer: Risky Heat: Poor; may alter color or star Chemicals that harm: Boron   Crystal Structure Crystal system: Hexagonal (trigonal), dipyramidal, barrel and tabloid shape. MAJOR SOURCES Sri Lanka, Thailand, India, Australia, Kampuchea 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 Oval black star sapphire. Marquise black star sapphire.   Round black star sapphire. Oval blue star sapphire.   Round blue star sapphire.

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