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Majorica pearl jewellery. Majorica is a Spanish company that manufactures hand-made pearls called Majorica pearls. [1] Now based in Majorca, the company was founded in 1890 in Barcelona. [1] In 1990, Gems & Gemology described Majorica pearls as "the most widely marketed and meticulously manufactured imitation [pearl] today". [1]
GIA was also responsible for the first modern diamond grading reports, where it introduced grading methodologies for diamond color and diamond clarity. Current research at gemological laboratories concerns the development of improved detection techniques for treated and synthetic diamonds, as well as for treated sapphires, rubies and pearls.
The original Japanese cultured pearls, known as akoya pearls, are produced by a species of small pearl oyster, Pinctada fucata martensii, which is no bigger than 6 to 8 cm (2.4 to 3.1 in) in size, hence akoya pearls larger than 10 mm in diameter are extremely rare and highly priced. Today, a hybrid mollusk is used in both Japan and China in the ...
The Tennessee River Pearl Farm has since been featured in a variety of national publications and television broadcasts including National Geographic (August 1985), [5] Southern Living Magazine, [7] Forbes (August 6, 1990), [7] Audubon (March 1985), [7] Smithsonian (Jan 1998), [7] Town & Country (Dec 2002), [7] National Geographic video ...
Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...
This mussel produced a high volume of low-quality pearls that came to be known as "raisin pearls" in the 1970s and 1980s. More than a decade ago the freshwater pearl industry of China shifted production from the cockscomb pearl mussel to the triangle shell mussel (Hyriopsis cumingii). The triangle shell produced fewer pearls, accepting only 12 ...