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Evalyn McLean (née Walsh; August 1, 1886 – April 26, 1947) was an American mining heiress and socialite, famous for reputedly being an owner of the 45-carat (9.0 g) Hope Diamond (which was bought in 1911 for US$180,000 from Pierre Cartier), as well as another famous diamond, the 94-carat (18.8 g) Star of the East.
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.
Golconda diamonds are mined in the Godavari-Krishna delta region of Andhra Pradesh, India. Golconda Fort in the western part of modern-day Hyderabad was a seat of the Golconda Sultanate and became an important centre for diamond enhancement, lapidary, and trading.
Although diamonds on Earth are rare, extraterrestrial diamonds (diamonds formed outside of Earth) are very common. Diamonds so small that they contain only about 2000 carbon atoms are abundant in meteorites, and some of them formed in stars before the Solar System existed. [1]
Bort-like heavily twinned diamond from Congo. Bort is commonly used as an abrasive. Smaller flakes and particles are used as an additive for scouring or polishing pastes and agents. Larger particles can be added to cutting, drilling and grinding tools to improve their lifespan and substantially increase their efficiency. [4]
The Noor-ul-Ain is the principal diamond mounted in a tiara of the same name made for Iranian Empress Farah Pahlavi's wedding to Shah Mohammad Reza Pahlavi in 1958. The tiara was designed by Harry Winston. It is a modern design, featuring 324 pink, yellow, and white diamonds set in platinum. It is said to weigh around 2 kg (4.4 lb).
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The Hope Diamond is a 45.52 carats (9.104 g; 0.3211 oz) diamond that has been famed for its great size since the 18th century. Extracted in the 17th century from the Kollur Mine in Guntur , India , [ 1 ] [ 2 ] the Hope Diamond is a blue diamond .