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Sapphire is a precious gemstone, a variety of the mineral corundum, ... both of these categories of treatment actually involve diffusion processes. [46]
Ruby is one of the traditional cardinal gems, alongside amethyst, sapphire, emerald, and diamond. [3] The word ruby comes from ruber, Latin for red. The color of a ruby is due to the element chromium. Some gemstones that are popularly or historically called rubies, such as the Black Prince's Ruby in the British Imperial State Crown, are ...
Some gemstones that are popularly or historically called rubies, such as the Black Prince's Ruby in the British Imperial State Crown, are actually spinels. These were once known as "Balas rubies". The quality of a ruby is determined by its color, cut, and clarity, which, along with carat weight, affect its value. The brightest and most valuable ...
Opal & White Sapphire Half Halo Earrings These fashionable earrings are ideal for special occasions or everyday wear. They have a luminous natural opal surrounded by a half-halo of white sapphires ...
Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London [12] Bismarck Sapphire: Myanmar: 98.56 carats (19.712 g) Table Blue National Museum of Natural History, Washington [13] James J. Hill Sapphire: 22.66 carats (4.532 g) Cornflower National Museum of Natural History, Washington [14]
Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem , jewel , precious stone , semiprecious stone , or simply gem ) is a piece of mineral crystal which, when cut or ...
Sapphire Sapphire. Sapphire, Heb. mghry Septuag. sappheiron; Vulg. sapphirus. Sapphire was the fifth stone of the rational (Ex., xxviii, 19; xxxix, 13), and represented the tribe of Issachar. It is the seventh stone in Ezech., xxviii, 14 (in the Hebrew text, for it occurs fifth in the Greek text); it is also the second foundation stone of the ...
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