This looks like a black pyramid, but is actually an uncut black diamond from Sierra Leone. Gem-quality black diamonds are rare; they are mainly used in industry because of their ability to cut the hardest materials. Looks like a little pyramid.
Diamonds are a hard crystalline form of carbon. These uncut diamonds are from the Russian State Precious Metals and Gemstones Collection Fund, part of the Russian Finance Ministry. Photographed in Moscow, in March
Garnet Inclusion in Diamond This stone is classified as "flawed" but I don't think so. INTERESTING because the diamond in my engagement ring contains a green garnet -- known as tsavorite -- that's why i loved it so much!
hortensia diamond 20 Carats, a peach coloured stone, named after the Queen of Holland, the step-daughter of Napoleon Bonaparte. This gem is part of the French Crown Jewels and is seen at the Louvre in Paris.