TREATMENT : Heat

GlassFilled

Ruby is gem-quality red corundum. The color comes from traces of chromium. All other color varieties of gem-quality corundum are referred to as sapphire. Most gemological authorities expect a medium to medium dark-red color tone in a ruby

Sapphire is a precious gemstone, formed from a mineral called corundum. Blue sapphires get their colour from titanium and iron trace elements. On the Mohs scale of mineral hardness, blue sapphire rates 9 out of 10, so it is a very durable gem. The word 'sapphire' comes from the Greek word sapphirus which means blue

Emerald is a gemstone and a variety of the mineral beryl colored green by trace amounts of chromium or sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness is classified as generally poor. Emerald is a cyclosilicate

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