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Smoky quartz is common and was not historically important, but in recent times it has become a popular gemstone, especially for jewelry. [ 12 ] Sunglasses , in the form of flat panes of smoky quartz, were used in China in the 12th century.
Two-layered onyx. Cameo of Roman Emperor Augustus wearing a gorgoneion and a sword-belt. Three-layered sardonyx cameo, Roman artwork, c. 14 –20 AD. Cameo (/ ˈ k æ m i oʊ /) is a method of carving an object such as an engraved gem, item of jewellery or vessel.
Old School RuneScape is a massively multiplayer online role-playing game (MMORPG), developed and published by Jagex.The game was released on 16 February 2013. When Old School RuneScape launched, it began as an August 2007 version of the game RuneScape, which was highly popular prior to the launch of RuneScape 3.
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Amethyst is a violet variety of quartz.The name comes from the Koine Greek αμέθυστος amethystos from α - a-, "not" and μεθύσκω (Ancient Greek) methysko / μεθώ metho (Modern Greek), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. [1]
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Opals too thin to produce a "natural" opal may be combined with other materials to form "composite" gems. An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian. The darker backing emphasizes the play of color ...
Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia. Quartz is the mineral defining the value of 7 on the Mohs scale of hardness , a qualitative scratch method for determining the hardness of a material to abrasion.