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The Eagle Diamond is a gemstone discovered in Eagle, Wisconsin in 1876 that was about 16 carats. It was found on a hillside about 30 feet below the surface in glacial till while digging a well. [1] It was one of more than a dozen rare gems stolen in a heist from the American Museum of Natural History in 1964 and remains missing to this day. [2]
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Lucara Diamond, in a news release Wednesday, said the "exceptional 2,492-carat diamond" was a "remarkable find" and "one of the largest rough diamonds ever unearthed." It was recovered using the ...
That diamond on your wedding ring isn't as rare as you might think, according to new research. There are over a quadrillion tons of diamonds lurking 100 miles below the Earth's surface, according ...
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Small rough diamonds from Russia. Crystals are about 0.7 to 0.9 mm in size. There are a limited number of commercially available diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. [1]
The lake Ellen Kimberlite is popular with rock hounds as the classic indicator minerals (pyrope, magnesian ilmenite and chrome diopside) for kimberlite are easily found in the material, though few are of gem quality and size. While there was considerable interest in diamond exploration in Michigan's Upper Peninsula and northern Wisconsin for ...