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2. Oltu stone - Wikipedia

   en.wikipedia.org/wiki/Oltu_stone

   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. Oltu stone pendants

3. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   The most significant archaeological evidence comes from the Royal Cemetery of Ur, where hundreds of burials dating 2900–2300 BC were unearthed; tombs such as that of Puabi contained a multitude of artefacts in gold, silver, and semi-precious stones, such as lapis lazuli crowns embellished with gold figurines, close-fitting collar necklaces ...

4. Bowenite - Wikipedia

   en.wikipedia.org/wiki/Bowenite

   Polished slab of bowenite serpentine, a variety of antigorite.. Bowenite is a hard, compact variety of the serpentinite species antigorite (Mg 3 (OH)O 4 Si 2 O 5). [1] Classed as a semi-precious gemstone, [2] it has been used for tools, weapons and jewellery by the Māori in New Zealand, [3] [4] and for jewellery by Fabergé. [5]

5. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   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.

6. Native American jewelry - Wikipedia

   en.wikipedia.org/wiki/Native_American_jewelry

   Coral and other semi-precious stones came into common use around 1900. One of the most important forms of Navajo and Southwestern Native American jewelry, is the Squash Blossom Necklace. Most are made of a string of plain round silver beads, interspersed with more stylized "squash blossoms", and feature a pendant, or "naja", hung from the ...

7. Cameo (carving) - Wikipedia

   en.wikipedia.org/wiki/Cameo_(carving)

   Ancient and Renaissance cameos were made from semi-precious gemstones, [3] especially the various types of onyx and agate, and any other stones with a flat plane where two contrasting colours meet; these are "hardstone" cameos.