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| Fluorite Illinois, USA |
#jewelleryfacts365 150/365 Gem fact
Obsidian is a natural glass that is formed during volcanic eruptions, as a result of quickly cooled lava, which is the parent material.
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| Raw obsidian |
#jewelleryfacts365 149/365
Egypt and Mesopotamia were the first two ancient civilizations that started organized production of jewelry.
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| Ancient Mesopotamia Jewellery |
#jewelleryfacts365 148/365 Gem fact
Garnet sand is a good abrasive, and a common replacement for silica sand in sand blasting. Mixed with very high pressure water, garnet is used to cut steel.
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| Ladybug pendant with garnet and black onyx (sterling silver and copper) |
#jewelleryfacts365 147/365 Gem fact
The pink color of tourmalines from many fields is the result of prolonged natural irradiation. Some tourmaline gems, especially pink to red colored stones, are altered by heat treatment to improve their color. Irradiation is almost impossible to detect in tourmalines, and does not, currently, impact the value. Heat treatment is also used to enhance tourmaline. Heavily-included tourmalines, such as rubellite and Brazilian paraiba, are sometimes clarity-enhanced. A clarity-enhanced tourmaline (especially paraiba) is worth much less than a non-treated gem. (source)
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| Sterling silver gold plated pendant with pink tourmaline |
#jewelleryfact365 146/365 Gem fact
Rarely, gem-quality tanzanite will heat to a green primary hue, most always accompanied by a blue or violet secondary hue. These green tanzanite have some meaningful value in the collector market, but are seldom of interest to commercial buyers.(source)
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