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2. Amethyst - Wikipedia

   en.wikipedia.org/wiki/Amethyst

   Amethyst is a purple variety of quartz (SiO. 2) and owes its violet color to irradiation, impurities of iron (Fe3+. ) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2][3][4] The irradiation causes the iron Fe3+.

3. Rivière (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Rivière_(jewellery)

   Rivière (jewellery) A rivière is a necklace consisting of one or more strings of linked gemstones. Usually only one kind of gemstone is used in a rivière, with all stones of the same colour and cut. The stones are either all the same size, or gradually increase in size towards the middle of the necklace. Rivières have been worn since the ...

4. House of Fabergé - Wikipedia

   en.wikipedia.org/wiki/House_of_Fabergé

   Purple amethyst cane handle by Fabergé with white enamel, rose and yellow gold, and a string of pearls. Circa 1890–1898. Amongst Fabergé's more popular creations were the miniature hardstone carvings of people, animals and flowers carved from semi-precious or hardstones and embellished with precious metals and stones. The most common animal ...

5. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   Jewellery. 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. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example.

6. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   Clarity grading in coloured gemstones is based on the eye-clean standard, that is, a gem is considered flawless if no inclusions are visible with the unaided eye (assuming 20/20 vision). [29] The Gemological Institute of America classifies tanzanite as a Type I gemstone, meaning it is normally eye-clean.

7. Is This Diamond Necklace Responsible for Marie Antoinette's ...

   www.aol.com/diamond-necklace-responsible-marie...

   September 25, 2024 at 8:43 AM. A Marie-Antoinette-linked Necklace to Be Sold Cecil Beaton. As they say, a piece of jewelry has the power to tell many stories. This particular diamond necklace ...