Learn to Use a Diamond Tester and Chelsea Filter (Video) - Gem Society
Learn to Use a Diamond Tester and Chelsea Filter (Video) - Gem Society
May 26, 2020
gemsociety.org
How to tell if an emerald is Colombian (Chelsea filter test explained) The Chelsea filter is one of the quickest tools jewelers use to begin identifying emerald origin. If the stone flashes red under the filter, it might be Colombian because of chromium content — and if it stays green, it’s usually Zambian. It’s simply step one before spectroscopy, trace-element analysis, and lab testing — and yes, I already know the comments are going to come for me on this one. #Emerald #colombianemeralds #ass
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Wait… why didn’t my emerald glow red under the Chelsea filter? Let’s talk about the Chelsea filter, a tool often used to test emeralds. What it actually detects is chromium, the element that gives many emeralds their rich green color. When an emerald is chromium-rich, it might glow pink or red under this filter. But here’s the twist… not all natural emeralds glow red. Some, even from Colombia, can appear yellow-green or do nothing at all. Why? Because they may contain lower chromium or a mix of
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