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https://www.jtv.com/library/article/gemstone-how-to-identify
The easiest clue for separating and identifying gemstones is color. Color is a combination of hue, tone, and saturation, and you'll evaluate all of those during general observation. In general, don't shine a light through the stone to value its color, unless it …
https://www.gemselect.com/other-info/gemstone-list.php
Oct 17, 2007 · Gems are always measured in Millimeter (mm) Dimensions are given as; length x width x depth, except for round stones which are; diameter x depth. Select gems by size, not by weight! Gem varieties vary in density, so carat weight is not a good indication of size. Note: 1ct = 0.2g
https://www.gemsociety.org/article/how-gems-are-identified/
Testing a gem’s reaction to ultraviolet (UV) light is one technique that can be used for gem identification. All rubies, both natural and synthetic, fluoresce under UV light. However, there are some slight differences in fluorescence between natural and synthetic rubies and even between stones sourced from different geographic locations.
https://www.gemsociety.org/gemstone-encyclopedia/
“ Emerald by day, ruby by night,” alexandrite is well known for displaying one of the most remarkable color changes in the gem world — green in sunlight and red in incandescent light. However, the modern June birthstone is so rare and expensive few people have seen a natural alexandrite.
https://www.thesprucecrafts.com/stones-in-vintage-costume-jewelry-4026020
Originated as a natural gemstone cut later copied by stone manufacturers and fashioned of glass or plastic. Costume jewelry manufacturers such as DeLizza & Elster (makers of “Juliana”) and Hattie Carnegie used brightly-colored cabochons of this type in some of their most popular designs.
https://www.kassoy.com/prodcat/Gemstone-Identification.asp
Gemstone Identification. Gemstone identification is a delicate procedure that requires accurate and efficient gemstone identification tools. Whether you need a simple filter set or you’re ready to invest in a deluxe travel lab, Kassoy's carefully designed gemstone identification tools will move your business to the next level. Ask an expert which gemstone identification tools best fit the needs of your business; …
https://treasurequestmining.com/treasure-identification/gems/
Amethyst – Known for its regal purple color, this member of the quartz family has long been cherished as a gemstone and frequently worn in jewelry. In Greek mythology, it is believed that Dionysus, created this stone. Amethyst is the birthstone for February.
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