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Rubellite is the red or pink variety of tourmaline and is a member of elbaite. Rubellite is also the rarest gem in its family. [2] It is occasionally mistaken for ruby. [3] These gems typically contain inclusions. [4] Notable countries where rubellite can be mined include Afghanistan, Brazil, Madagascar, Myanmar, Nigeria, Russia, and the United ...
Some tourmaline gems, especially pink to red colored stones, are altered by heat treatment to improve their color. Overly dark red stones can be lightened by careful heat treatment. The pink color in manganese-containing near-colorless to pale pink stones can be greatly increased by irradiation with gamma-rays or electron beams.
The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.
Morganite is an orange or pink variety of beryl and is also a gemstone. [2] Morganite is mined in Brazil, Afghanistan, Mozambique, Namibia, the United States, and Madagascar. [3] Morganite has grown in popularity since 2010. [2] Brides and CNN have listed it as a possible alternative to diamond for engagement rings. [4] [5]
This is a list of gemstones, organized by species and types. Minerals ... Tourmaline subgroup: Achroite (var.) Chrome (var.) ... Download as PDF; Printable version;
Elbaite is allochromatic, meaning trace amounts of impurities can tint crystals, and it can be strongly pleochroic. Every color of the rainbow may be represented by elbaite, some exhibiting multicolor zonation. Microscopic acicular inclusions in some elbaite crystals show the cat's eye effect in polished cabochons.
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.
Image Gemstones Notes Ref; Swat: Emerald, quartz, and epidote: Various types of quartz are found in the region. The image shows a specimen of aquamarine and emerald on quartz from Swat valley. [3] Dir: Corundum and quartz The image shows pink and purple crystals of corundum. [3] Mansehra: Corundum and smoky quartz: The image shows aquamarine on ...