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Since the per carat price of diamond shifts around key milestones (such as 1.00 carat (200 mg)), many one-carat diamonds are the result of compromising cut for carat. Some jewelry experts advise consumers to buy a 0.99-carat (198 mg) diamond for its better price or buy a 1.10-carat (220 mg) diamond for its better cut, avoiding a 1.00-carat (200 ...
Cullinan V is an 18.8-carat (3.76 g) heart-shaped diamond set in the centre of a platinum brooch that formed a part of the stomacher made for Queen Mary to wear at the Delhi Durbar in 1911. The brooch was designed to show off Cullinan V and is pavé-set with a border of smaller diamonds.
It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush and led to the excavation of the open-pit mine called the Big Hole. Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however this ...
In his preface to the first edition of the book, Collins says that he based his eponymous "Moonstone" on the histories of two stones: the Orlov, a 189.62-carat (37.9 g) diamond in the Russian Imperial Sceptre, and the Koh-i-Noor. [84]
The synthetic stones start at $200 for a quarter carat to $800 for a full carat diamond. The new lab-grown diamonds retail for about one-tenth the cost of naturally occurring diamonds.
Nigeria might then be the 3rd most populous country in the world. In 2100, the population of Nigeria may reach 541 million. [ 31 ] While the overall population is expected to increase, the growth rate is estimated to decrease from 1.2 per cent per year in 2010 to 0.4 per cent per year in 2050. [ 30 ]
24-carat gold is pure (while 100% purity is very difficult to attain, 24-carat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-carat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-carat gold is 12 parts gold (12 parts another metal), and so forth.
Tourmaline is a six-member ring cyclosilicate having a trigonal crystal system. It occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section, often with curved striated faces. The style of termination at the ends of crystals is sometimes asymmetrical, called hemimorphism.
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