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  2. Jewellery cleaning - Wikipedia

    en.wikipedia.org/wiki/Jewellery_cleaning

    The cleaner would first inspect the jewelry to ensure that the gemstones are accounted for and secured. Materials that can handle it are often placed in an ultrasonic bath using a cleaning solution and later put through a steam cleaner, while more sensitive materials will go through light brushing in soapy water.

  3. Pietra dura - Wikipedia

    en.wikipedia.org/wiki/Pietra_dura

    Altar frontal of Italian opera di commessi, Dubrovnik Cathedral Detail of design with roses over crossed canes, 1882. Pietra dura (Italian: [ˈpjɛːtra ˈduːra]), pietre dure ([ˈpjɛːtre ˈduːre]) or intarsia lapidary [1] (), called parchin kari or parchinkari (Persian: پرچین کاری) in the Indian Subcontinent, is a term for the inlay technique of using cut and fitted, highly ...

  4. Opificio delle pietre dure - Wikipedia

    en.wikipedia.org/wiki/Opificio_delle_pietre_dure

    The Opificio delle pietre dure, literally meaning "Workshop of semi-precious stones", is a public institute of the Italian Ministry for Cultural Heritage based in Florence. It is a global leader in the field of art restoration and provides teaching as one of two Italian state conservation schools (the other being the Istituto Superiore per la ...

  5. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    In Assyria, men and women both wore extensive amounts of jewellery, including amulets, ankle bracelets, heavy multi-strand necklaces, and cylinder seals. [39] Jewellery in Mesopotamia tended to be manufactured from thin metal leaf and was set with large numbers of brightly coloured stones (chiefly agate, lapis, carnelian, and jasper).

  6. Carnelian - Wikipedia

    en.wikipedia.org/wiki/Carnelian

    Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone.Similar to carnelian is sard, which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.

  7. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    While jade has been since earliest times the most prized semi-precious stone for carving in East Asia and Pre-Columbian America, in Europe and the Middle East the different varieties of quartz were the most commonly used for the various types of jewelry and hardstone carving, including engraved gems and cameo gems, rock crystal vases, and ...

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