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A birthstone is a gemstone that represents a person's birth period, usually the month or zodiac sign. Birthstones are often worn as jewelry or a pendant necklace. History of birthstones
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There are over 300 types of minerals that have been used as gemstones. Such as: A–B. Actinolite. ... Sapphire (var.) Padparadscha; Golden sheen sapphire; Covellite;
Logan Sapphire; Star of Bombay, given to Mary Pickford by Douglas Fairbanks, Sr; Star of India; Stuart Sapphire; Black Star of Queensland; Star of Adam, with a weight of 1,404.49 carats (280.898 g), it is the largest star sapphire in the world. Queen Marie of Romania Sapphire
It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red, which is called a ruby. [1] Pink colored corundum may be either classified as ruby or sapphire depending on locale.
Sapphire Sapphire Sapphire - Greek ὑάκινθος hyakinthos ; Vulg. hyacinthus ; the eleventh stone of the foundation of the heavenly city (Revelations 21:20). The genuine sapphire is a beautiful blue hyaline corundum and is composed of nearly pure alumina, its color resulting from the presence of iron oxide .
Wafers of single-crystal sapphire are also used in the semiconductor industry as substrates for the growth of devices based on gallium nitride (GaN). The use of sapphire significantly reduces the cost, because it has about one-seventh the cost of germanium. Gallium nitride on sapphire is commonly used in blue light-emitting diodes (LEDs). [68]
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