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The Portuguese Diamond, on exhibit at the National Museum of Natural History, Washington D.C. The Portuguese Diamond is a large octagonal-cut diamond known for its flawlessness and clarity . It weighs 127.01 carats (25.402 g).
His poverty led him to sell many of the remaining diamonds. The last and finest diamond of the Portuguese crown jewels, the Sancy, would be acquired by Nicolas de Harlay, seigneur de Sancy, [2] [3] from whom it would make its way to Maximilien de Béthune, duc de Sully. From Maximilien, the diamond would finally go to join the French crown jewels.
The Diadem of the Stars was made in the workshop of the Portuguese Royal Jeweler in Lisbon, Portugal. Commissioned in 1863, the tiara took three years before it was completed in 1866. It is fashioned out of gold, silver, and colourless diamonds, with the largest stone in the circlet a yellow diamond called the Maria Pia.
When discovered in 1905 the 3106.75 carat (621.35 g) Cullinan was the largest rough gem-quality diamond ever found. It was cut into 105 diamonds including the Cullinan I or the Great Star of Africa, 530.2 carats (106.04 g), and the Cullinan II or the Second Star of Africa, 317.4 carats (63.48 g), both of which are now part of the British Crown ...
An example of this is the marquise cut diamond which was popular in the 1970s to 1980s. In later decades, jewelers had little success in selling this shape in comparison to other shapes like the oval or pear shape. [citation needed] The marquise can be cut into an oval diamond by any diamond cutter with a loss of 5 to 10% in total weight.
The diamond was discovered by Ernestine Ramaboa in May 1967 at the Letseng-la-Terai diggings in Lesotho. The crystal was sold at auction in Maseru to a South African dealer who then sold it to a European dealer. It was later purchased in Geneva by Winston. In 1969, he had it cut into eighteen stones totalling 242.50 carats (48.500 g; 1.7108 oz).
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