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The metamorphic types of gems constitute 90% of the gem deposits in Sri Lanka. It has been estimated that nearly 25% of the total land area of Sri Lanka is potentially gem-bearing, making Sri Lanka one of the countries with the highest density of gem deposits compared to its landmass. [3] [4]
It is among the few gemstones that are naturally radioactive. Most ekanite is mined in Sri Lanka, although deposits also occur in Russia and North America. Clear and well-colored stones are rare as the radioactivity tends to degrade the crystal matrix over time in a process known as metamictization.
Geuda (ගෙවුඩ, pronounced gay-yoo-dah [needs IPA]) is a form of the mineral corundum, or sapphire, found primarily in Sri Lanka. Around 70%-80% of gems mined in Sri Lanka belong to geuda varieties. Because of its semitransparent and milky appearance due to rutile inclusions, these stones have little value as gemstones in their natural ...
The gem is named after its discoverer, Austrian geologist Richard Taaffe, who found the first stone in 1945. Taaffeite has thus far only been unearthed in Tanzania and Sri Lanka. ©Shutterstock.com
Found in Sri Lanka, Myanmar, Vietnam, Afghanistan, Tajikistan and some African countries, spinels come in a range of colors, from vivid blue, pink and red to dusky grey, green and purple.
Sri Lanka 478.68 carats (95.736 g) Cushion Blue Anonymous owner [6] Logan Sapphire: Sri Lanka 422.99 carats (84.598 g) Cushion Blue National Museum of Natural History, Washington [7] Star of Asia: Burma 330 carats (66 g) Star Blue National Museum of Natural History, Washington [8] Star of Artaban: Sri Lanka 287 carats (57.4 g) Star Blue-violet
The gemstone is mined across the globe in Namibia, Tanzania, Myanmar, Brazil, Iran, Afghanistan, Pakistan, India and Sri Lanka, according to Geological Institute of America. Garnet meaning
The Logan Sapphire brooch, National Museum of Natural History, Washington, D.C. The Logan Sapphire is a 422.98-carat (84.596 g) sapphire from Sri Lanka.One of the largest blue faceted sapphires in the world, it was owned by Victor Sassoon and then purchased by M. Robert Guggenheim as a gift for his wife, Rebecca Pollard Guggenheim, who donated the sapphire to the Smithsonian Institution in 1960.