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Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale . [ 2 ]
It was determined that the element copper was important in the coloration of the stone. [28] A large bluish-green tourmaline from Paraiba, measuring 36.44 mm × 33.75 mm × 21.85 mm (1.43 in × 1.33 in × 0.86 in) and weighing 191.87 carats (1.3536 oz; 38.374 g), is the world's largest cut tourmaline.
Tourmaline “A favorite stone of gem collectors for its beautiful crystalline structure and tonal variety from pink to blue-green, tourmalines are a heart-centric stone that can enhance self-love ...
A gemstone (also called a ... Other examples are the emerald (green), ... emeralds, and sapphires according to Gübelin Gemlab. Even though it is a tourmaline ...
The earliest known emerald is a single unengraved stone mounted in a gold ring, dated circa 330–300 BC. A 3rd century BC date is far too late for emeralds to appear in Exodus and Ezekiel. [5] However, the Greek and Latin terms smaragdos, smaragdus are broad enough to include other green gemstones, the most valuable of which was the emerald.
If it is used as a ring stone, the facet edges will be easily abraded, the faces will be easily scratched, and the stone might be chipped with even a slight impact. [3] It is seen as an inexpensive alternative to naturally-occurring green gemstones, such as emerald and peridot. Helenite can also come in various red, green and blue varieties. [3]
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