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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 polished, is used to make jewelry or other adornments.
Oltu stone (Turkish: Oltu taşı) is a kind of jet found in the region around Oltu town within Erzurum Province, eastern Turkey. The organic substance is used as semi-precious gemstone in manufacturing jewellery.
This is a list of gemstones, organized by species and types. Minerals. There are over 300 types of minerals that have been used as gemstones. Such as: A–B
Lapis lazuli (UK: / ËŒ l æ p ɪ s ˈ l æ z (j) ÊŠ l i, ˈ l æ Ê’ ÊŠ-,-ËŒ l i /; US: / ˈ l æ z (j) É™ l i, ˈ l æ Ê’ É™-,-ËŒ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
Many precious and semiprecious stones are used for jewellery. Among them are: Amber Amber, an ancient organic gemstone, is composed of tree resin that has hardened over time. The stone must be at least one million years old to be classified as amber, and some amber can be up to 120 million years old. Amethyst
Jet jewellery (both vintage and new) was then to remain out of fashion until the late '70s. [51] In the '80s there was a fashion for jet beads and antique jet jewellery started to rise in value. [52] New jewellers took up the production of jet jewellery. [52]
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