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The pear-shaped drop diamonds each weigh about 20 carats (4 g). Diana, Princess of Wales, borrowed them in 1983 to wear on her first official visit to Australia. At a state banquet, she wore the earrings with a tiara from her family's own collection. [66] The Greville Pear-drop Earrings passed to Elizabeth II upon her mother's death in 2002. [67]
In 1977, cubic zirconia began to be mass-produced in the jewelry marketplace by the Ceres Corporation, with crystals stabilized with 94% yttria. Other major producers as of 1993 include Taiwan Crystal Company Ltd , Swarovski and ICT inc. [ 8 ] [ 5 ] By 1980, annual global production had reached 60 million carats (12 tonnes) and continued to ...
Yttria blends of approximately 3% are called either tetragonal polycrystalline zirconia or tetragonal zirconia polycrystal (forming the initialisms TZP or TPZ) and have the finest grain size. These grades exhibit the highest toughness at room temperature, because they are nearly 100% tetragonal, but this degrades severely between 200 and 500 ...
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