{"id":48862,"date":"2023-08-10T15:18:11","date_gmt":"2023-08-10T13:18:11","guid":{"rendered":"https:\/\/thenaturalgem.com\/?p=48862"},"modified":"2023-08-10T15:18:15","modified_gmt":"2023-08-10T13:18:15","slug":"surface-treatment-of-gemstones-from-crack-filling-to-lasering","status":"publish","type":"post","link":"https:\/\/thenaturalgem.com\/en\/surface-treatment-of-gemstones-from-crack-filling-to-lasering\/","title":{"rendered":"<span>Surface treatment of gemstones: from crack filling to lasering<\/span>"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Most gemstones are treated in some way &#8211; with the aim of improving them. There are many different methods for surface treatment of gemstones, using oil, resin, glass and other substances.<\/p>\n<p>[\/vc_column_text]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"line-height: 150%; text-align: center;\"><span lang=\"de\">Gemstone treatments: Surface texture refinement<\/span><\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][vc_column][vc_row_inner][vc_column_inner width=&#8221;3\/4&#8243;][vc_column_text]<a href=\"https:\/\/thenaturalgem.com\/en\/rough-gemstones-untreated-natural-gems\/\">Untreated gemstones<\/a> are particularly valuable and best suited as an investment. However, there are not enough gemstones that are naturally of pristine quality, so most are treated. This may seem sensible for aesthetic reasons, but treatments reduce the value of the minerals. This excludes cutting and polishing, which are what turn a rough stone into a sparkling gem in the first place.<\/p>\n<p><a href=\"https:\/\/thenaturalgem.com\/en\/gemstone-treatments\/\">Typical treatments<\/a> are <a href=\"https:\/\/thenaturalgem.com\/en\/heat-treatment-of-gemstones\/\">firing or heating<\/a> and <a href=\"https:\/\/thenaturalgem.com\/en\/irradiation-of-gemstones\/\">irradiation<\/a>. There are also surface treatment methods for gemstones. Some are permanent &#8211; such as heating &#8211; while others are temporary and can be reversed. Oil and resin, for example, used for crack filling and impregnation, dry out and dissolve over time.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=&#8221;1\/4&#8243;][vc_single_image image=&#8221;27825&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][\/vc_column_inner][\/vc_row_inner]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Crack filling<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Cracks in gemstones are filled with colorless substances such as oil, resin, glass or plastics to conceal the cavities and make them unrecognizable to the naked eye. Usually, the fillers are fused to the original stone by heating.<\/p>\n<h3><span>Ruby: Crack filling with lead glass<\/span><\/h3>\n<p>In ruby, lead glass is used as a filler, and the liquid glass is forced into the cracks and bonds with the gem substance as it solidifies. The treatment is not permanent, as lead glass is very sensitive to acid. Even lemon juice is enough to damage the glass filling.<\/p>\n<h3><span>Emerald: crack filling with cedar oil or resin<\/span><\/h3>\n<p>Due to its crystalline structure, the emerald often has <a href=\"https:\/\/thenaturalgem.com\/en\/inclusions-in-gemstones\/\">inclusions<\/a> and cracks, which is why the demands on its purity are less strict and these blemishes are rather considered beauty spots. Hardly any emerald in the trade is not treated.<\/p>\n<p>In the case of emerald, cedar oil is used to improve its purity. The refraction of the oil is similar to that of the gemstone, which is why the cracks virtually disappear to the human eye. During the treatment, the stone is first placed in acids to clean it, and then in a heated hydraulic cylinder with cedar oil. Sometimes a vacuum pump is also used to pull the air out of the cracks so that the oil can penetrate deeper. Nowadays, resins are also often used to fill cracks in emeralds &#8211; though this practice is controversial in the industry.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Diffusion treatment<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Diffusion treatment is a high-temperature treatment involving the addition of color-producing elements (e.g., chromium or beryllium), which are introduced into the surface layer of the gemstone. This enhances the intensity of the <a href=\"https:\/\/thenaturalgem.com\/en\/the-colors-of-gemstones\/\">color<\/a> &#8211; however, it can happen that the artificially created color disappears again through polishing or grinding.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Vapor deposition or coating<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column width=&#8221;1\/4&#8243;][vc_single_image image=&#8221;48841&#8243; alignment=&#8221;center&#8221;][\/vc_column][vc_column width=&#8221;3\/4&#8243;][vc_column_text]Gemstones can be artificially colored by means of physical vapor deposition (PVD). The surface of the stone is coated with an extremely thin layer of metal (e.g. titanium or gold), which then hardens and increases the color intensity. This is how the rainbow colors of the mystic topaz are created, for example.[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Impregnate<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">To stabilize gemstones and make them more resistant, as well as to conceal minor cracks, porous and fragile specimens are sometimes impregnated with synthetic resin, or more rarely, wax or kerosene. In this process, the cracks are first filled with resin and then sealed with UV light. This treatment additionally smoothes the surface of the stones.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column]<div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/uploads\/2020\/05\/bildschirmfoto-2020-05-12-um-11.09.04.png\"><\/div><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Laser<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1589879657419{margin-top: 20px !important;}&#8221;][vc_column width=&#8221;3\/4&#8243;][vc_column_text]Laser treatment has been used for diamonds for not too long. Laser drilling involves drilling into inclusions, dissolving them with acid, and finally filling them with a transparent substance such as glass or synthetic resin.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/4&#8243;][vc_single_image image=&#8221;48845&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"tng-custom-divider\"><\/div>[vc_column_text]<\/p>\n<h2 style=\"margin: 0cm; line-height: 150%; text-align: center;\">Treatments must be declared<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;][vc_single_image image=&#8221;48847&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221;][\/vc_column][vc_column width=&#8221;3\/4&#8243;][vc_column_text]Treatments must be transparently declared when <a href=\"https:\/\/thenaturalgem.com\/en\/where-to-buy-gemstones\/\">purchasing a gemstone<\/a>. In order to improve consumer protection, the International Confederation of Jewelry, Silverware, Diamonds, Pearls and Gemstones (CIBJO) has formulated globally applicable rules for the trade, which also address the treatment of gemstones.<\/p>\n<p>Apart from <a href=\"https:\/\/thenaturalgem.com\/en\/gemstone-cuts-cutting-styles-forms\/\">cutting<\/a> and polishing, all treatments must be clearly declared, as they have an influence on the <a href=\"https:\/\/thenaturalgem.com\/en\/what-makes-gemstones-valuable\/\">value of the gemstone<\/a>. A <a href=\"https:\/\/thenaturalgem.com\/en\/what-makes-gemstones-valuable\/\">certificate<\/a> from an internationally recognized, independent gemmological institute is therefore a must when buying gemstones.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Untreated gemstones are particularly valuable and best suited as an investment. However, there are not enough gemstones that are naturally of pristine quality, so most are treated.<\/p>\n","protected":false},"author":10,"featured_media":48863,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[226],"tags":[],"class_list":["post-48862","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Methods for surface treatment of gemstones | The Natural Gem<\/title>\n<meta name=\"description\" content=\"Learn about the methods of surface treatment of gemstones, what they do and what influence they have on the value of the jewels.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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