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A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires.

A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires.

Opal Group. Foto. Opal has been a popular gem for many centuries and has a very interesting structure. (...)

Opal Group. Foto. Opal has been a popular gem for many centuries and has a very interesting structure. (...)

ETHIOPIAN OPAL A fabulous rough opal nodule 2. Description from pinterest.com. I searched for this on bing.com/images

ETHIOPIAN OPAL A fabulous rough opal nodule 2. Description from pinterest.com. I searched for this on bing.com/images

Gemmy and extremely flashy blue cluster of Celestite crystals on matrix!  From the Sakoany Mine, Majunga, Madagascar.

Gemmy and extremely flashy blue cluster of Celestite crystals on matrix! From the Sakoany Mine, Majunga, Madagascar.

The Guinness Book of World Records names Painite as the rarest gem mineral on earth. Painite has so far only been found in Myanmar, Indonesia. Colours vary from pink to brown and like diamond, Painite will appear a different colour when viewed from different angles. Very few Painite crystals are known to exist and even fewer have been cut into gemstones.

The Guinness Book of World Records names Painite as the rarest gem mineral on earth. Painite has so far only been found in Myanmar, Indonesia. Colours vary from pink to brown and like diamond, Painite will appear a different colour when viewed from different angles. Very few Painite crystals are known to exist and even fewer have been cut into gemstones.

Olenite in Quartz. Sprays of Blue Tourmaline in a terminated Quartz Crystal ~ Diamontina, Minas Gerais, Brazil.  4 5/8" x 1 1/2".

Olenite in Quartz. Sprays of Blue Tourmaline in a terminated Quartz Crystal ~ Diamontina, Minas Gerais, Brazil. 4 5/8" x 1 1/2".

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