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The UV-sensitivity of natural citrine further indicates that its color is not caused solely by trace elements. [2] Most citrine on the market is heat-treated amethyst or smoky quartz. Amethyst loses its natural violet color when heated to above 200-300°C and turns a color that resembles natural citrine, but is often more reddish or brownish. [9]
Jewellery (or jewelry in American English) consists of decorative items worn for personal adornment such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes.
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The jewels consist of a single necklace with a pendant and a locket that was made in London in the 1870s and was a gift from the 9th Duke of Argyll to his soon-to-be wife. It consists of a chain made of diamonds studded with pearls, the pendant has a pearl set in the centre which is surrounded by two rows of diamonds of different shapes.
Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.
In 1912, to standardize birthstones, the (American) National Association of Jewelers (now called Jewelers of America) met in Kansas and officially adopted a list. [1]: 317 The Jewelry Industry Council of America updated the list in 1952 [3]: 311 by adding Alexandrite for June, citrine for November and pink tourmaline for October.
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