Black Onyx Gemstone Information Information * Loose gemstones * Jewelry links Onyx has been linked to lovers by causing discord and cooling the fires of passion. It was thought that onyx carved with Mars, the God of war, gave Roman soldiers courage. It was also once believed that dark onyx caused bad dreams and sad thoughts. View examples of cut black onyx below and prices in our store section.   ENHANCEMENT CODE D Click to view AGTA code. PROPERTIES Refractive Index 1.535-1.539 Hardness = 6.5-7 (Moh's Scale) Specific Gravity =2.60 Species - Chalcedony Optic Character - Aggregate. WARNINGS FOR CARE Ultrasonic: Safe Steamer: Safe Heat: Fair; color change may occur with heat Chemicals that harm: Hydrofluoric acid, nitric acid   Crystal Structure Crystal system: Hexagonal fibrous aggregates, micro crystalline quartz MAJOR SOURCES Brazil, Madagascar, Uruguay, US 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 Antique. Faceted. Square, buff top   Antique Cushion. Faceted cut. Buff top.   Heart Shapes. Faceted cut. Cabochons. Marquise. Faceted cut. Buff top. Cabochons. Octagon. Faceted cut. Oval shape. Faceted cut. Buff top. Cabochons.   Pear Shape. Faceted cut. Cabochons. Round Cuts. Faceted cut. Cabochons.

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