Gemstone Guide Archives - Natural Gemstones https://www.buygems.org/gems/category/gemstone-guide/ Natural Gemstones Information Thu, 25 Feb 2016 15:20:16 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 New Opal treatment against cracks https://www.buygems.org/gems/new-opal-treatment-against-cracks/ Mon, 17 Aug 2015 16:54:49 +0000 http://www.buygems.org/gems/?p=314 Historically, opal has been one of the few gemstones rarely subjected to any treatments. Sugar & acid carbon deposition used to be the predominant treatment applied to only a very specific and scarce type which then resembled natural black opal.…

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