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These diamonds have numerous industrial and commercial uses including cutting tools, thermal conductors and consumer diamond gemstones. Gemstone diamond producers [ edit ]
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]
In 1979, Gemstones Corporation of Pakistan was established to develop the gemstones sector in Pakistan, however in 1997 the corporation liquidated. [3] Now a number of organizations are working in this sector including All Pakistan Commercial Exporters Association of Rough & Unpolished Precious and Semi Precious Stones (APCEA) and Pakistan Gems and Jewellery Development Company (PGJDC).
Gem Testing Laboratory, Jaipur: This is a coloured gemstone centre in Jaipur. It grades and certifies all kinds of stones, its speciality is in coloured gemstones. Indian Gemological Institute, New Delhi: The Institute is located in New Delhi, IGI serves the gem testing and certification requirements of the industry in North India. [20] [21]
In creating jewellery, gemstones, coins, or other precious items are often used, and they are typically set into precious metals. Platinum alloys range from 900 (90% pure) to 950 (95% pure). The silver used in jewellery is usually sterling silver , or 92.5% fine silver.
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.