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The large diamond, found in South Africa, was presented to Edward VII on his 66th birthday. Two of the stones cut from the diamond were the 94.4-carat (18.88 g) Cullinan III, a clear pear-shaped stone, and a 63.6-carat (12.72 g) cushion-shaped stone. Queen Mary had these stones made into a brooch with the Cullinan III hanging from IV.
In 2008, the Wittelsbach Diamond, a 35.56-carat (7.112 g) blue diamond once belonging to the King of Spain, fetched over US$24 million at a Christie's auction. [60] In May 2009, a 7.03-carat (1.406 g) blue diamond fetched the highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (6.97 million ...
The Hope Diamond is a large, 45.52-carat (9.104 g; 0.3211 oz), [a] [7] [8] [9] deep-blue diamond, studded in a pendant Toison d ’or. [1] It is a dark greyish-blue color under ordinary light due to trace amounts of boron within its crystal structure, and it exhibits a red phosphorescence under exposure to ultraviolet light.
Diamond clarity is the quality of diamonds that relates to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects, called blemishes. Clarity is one of the four Cs of diamond grading, the others being carat , color , and cut .
The precise tensile strength of diamond is unknown, though strength up to 60 GPa has been observed, and theoretically it could be as high as 90–225 GPa depending on the sample volume/size, the perfection of diamond lattice and on its orientation: Tensile strength is the highest for the [100] crystal direction (normal to the cubic face ...
The gap is closed with a small bead that is held in place by the ring's tension. Larger gauge ball closure rings exhibit considerable tension, and may require ring expanding pliers for insertion and removal of the bead. Barbells – Barbells are composed of a thin, straight metal rod with a bead permanently fixed to one end. The other end is ...