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The necklace has nine large oblong aquamarines with an even bigger aquamarine pendant drop. Elizabeth II had the drop set in a more decorative diamond cluster and it is now detachable. She was so delighted with the gift that in 1957 she had a tiara made to match the necklace. [ 116 ]
Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
The crimson topaz was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Trochilus pella. [5] Linnaeus based his description on the "Long-tail'd red huming-bird" that had been described and illustrated by the English naturalist George Edwards in 1743 from a specimen owned by Charles Lennox, the Duke of Richmond.
The genus Topaz was introduced by the English zoologist George Robert Gray in 1840 with the crimson topaz as the type species. [2] [3] The genus contains two species, the crimson topaz and the fiery topaz. [4] Although generally considered to be distinct species, they have in the past been thought to be conspecific by some authors. [5]
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