{"id":21135,"date":"2021-01-08T09:37:18","date_gmt":"2021-01-08T08:37:18","guid":{"rendered":"https:\/\/thenaturalgem.com\/?p=21135"},"modified":"2022-07-13T15:14:04","modified_gmt":"2022-07-13T13:14:04","slug":"colour-changing-gemstones","status":"publish","type":"post","link":"https:\/\/thenaturalgem.com\/en\/colour-changing-gemstones\/","title":{"rendered":"<span>COLOR-CHANGING STONES<\/span>"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Alongside truly multicolored variations, some gemstones possess definite effects that suggest a color change or at least a change in nuances of color.<\/p>\n<p style=\"text-align: center;\">Thus some gemstones can appear to be vivid in color when viewed from some angles, while appearing pale from others. Some stones appear to change their color depending on the light source under which they are viewed.<\/p>\n<p style=\"text-align: center;\">Various optical effects are responsible for such behaviour.<\/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><span><strong>PLEOCHROISM<\/strong><\/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]Pleochroism is an optical phenomenon in which a gemstone has different colors when viewed from different angles.<\/p>\n<p>The reason for this behaviour lies in the crystalline structure of the stone, which causes the light passing through it to be broken into the colors of the visible light spectrum. This refracted light is then reflected and refracted again, with some colors being absorbed by the stone.<br \/>\nCrystals with an optical axis cause the gemstone to show two main colors. This is called dichroism.<br \/>\nCrystals with two different axes can appear to have three different colors \u2013 trichroism.<\/p>\n<p>Strong color changes can often be seen in tanzanite (crimson, dark blue, yellow-brown) as well as spodumene (pink variation: kunzite), but other gemstones, such as rubies, emeralds and sapphires can also show some color-change properties.<br \/>\nDepending on the strength of the effect, one differentiates between strong, definite and weak pleochroism.<\/p>\n<p>If a gemstone has some pleochroism, it is important that this is taken into account during cutting.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=&#8221;1\/4&#8243;][vc_single_image image=&#8221;13584&#8243; img_size=&#8221;full&#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=\"text-align: center;\">Alexandrite-Effect<\/span><\/h2>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/4&#8243;]<div class=\"tng-quote-box\"><div class=\"tng-custom-divider\"><div class=\"tng-image\"><img decoding=\"async\" src=\"https:\/\/thenaturalgem.com\/wp-content\/themes\/_tng\/icons\/chat_white.svg\"><\/div><\/div><div class=\"inner\">Stones that show no or only weak color change are not considered to be alexandrite and are thus difficult to sell.<\/div><div class=\"tng-custom-divider\"><\/div><\/div>[\/vc_column][vc_column width=&#8221;3\/4&#8243;][vc_column_text]The alexandrite effect refers to the apparent change of color of a mineral when viewed under different light sources and is caused by the crystal lattice of the gemstone. Depending on the light source, different frequencies of the light spectrum are absorbed, making the stone appear, for example, more red or more green. This phenomenon is thus caused by the absorption of light.<\/p>\n<p>This kind of color change can be seen most strongly in <a href=\"http:\/\/www.thenaturalgem.com\/en\/product\/alexandrite\">alexandrite<\/a>, the gemstone after which the effect is named. When viewed in daylight the gemstone appears green-blue, while under incandescent light or natural candlelight it is red to violet.<\/p>\n<p>If you wish to buy an alexandrite as an investment, it is important to pay attention to its color change properties. Large stones with high clarity and strong color change are sought-after. Such stones are extremely rare and thus command very high prices.<\/p>\n<p>The amount of color change from green to red is measured in percent, with the best value being 100%. Do not buy a stone with a color change of under 50%; from 80-90% is excellent.<\/p>\n<p>This effect is only found in a few gemstones: alongside chrysoberyl (the generic mineral group for alexandrite), it can also be observed in garnet, <a href=\"http:\/\/www.thenaturalgem.com\/en\/product\/sapphire\">sapphire<\/a>, <a href=\"http:\/\/www.thenaturalgem.com\/en\/product\/tourmaline\">tourmaline<\/a> and <a href=\"http:\/\/www.thenaturalgem.com\/en\/product\/spinel\">spinel<\/a>.[\/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=\"text-align: center;\"><strong>FLUORESCENCE<\/strong><\/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]Fluorescence is an optical phenomenon that can be observed when an object is lit by an ultraviolet light source. It is the emission of visible light from the gemstone.<\/p>\n<p>Fluorescence in diamonds is absolutely undesirable, as a diamond must always have the same color, no matter what the lighting conditions. Only buy diamonds that have a certificate that shows they have no fluorescence.<\/p>\n<p>In contrast to diamonds, fluorescence in rubies is highly regarded; especially rubies from <a href=\"https:\/\/thenaturalgem.com\/en\/origin\/burma-en\/\">Burma<\/a> show a high level of fluorescence, due to their lack of iron and minimal chromium content. This can be seen by candlelight, when such a ruby develops a deep, glittering red color.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/4&#8243;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Alongside truly multicolored variations, some gemstones possess definite effects that suggest a color change or at least a change in nuances of color.<\/p>\n","protected":false},"author":610,"featured_media":13584,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[226],"tags":[],"class_list":["post-21135","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 v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Color-Changing Gemstones: On The Optical Effects | The Natural Gem<\/title>\n<meta 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