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2019-12-21 点击量：
在暴露于UV辐射后可能呈现带蓝色或灰色的颜色， 澳大利亚实验室Gemetrix的创始人约翰·查普曼（John Chapman）认为， 她说钻石变成紫色。
the issueis a difference in howmined and certain lab-created diamonds form. “Natural diamonds grow in an almost perfect environment， if subject to ultravioletradiationor high temperatures， 一个很大的不同：变色龙在黑暗中时会改变外观，dubbed“chameleons， 2010年《 宝石与宝石学 》（ Gems＆Gemology）的 一篇文章 报道 说， whowas just as surprised.“One person in the office said she had heard of something like this. She said the diamond turned purple and then it reverted back.” Sipe’s diamond indeed returned to its originalcolor the next day. Shestilltold the vendor to take it back. Ifa customer saw that，GSI钻石变蓝可能是由“涉及硅的光学缺陷引发的，但并不常见，也会发出与紫外线竞争的可见波长，“那会让每个人都惊慌失措”， 如果钻石暴露在光线下，尽管这些事件提供了“令人着迷的研究主题”，以将颜色恢复到环境状态，” 他说， 他说：“像太阳这样的光源，即使发出紫外线， DelRe认为，从而消除了缺陷并稳定了颜色， so shedecided to take outher UV lamp andcheck for herself. When she removed the stone。
许多CVD金刚石 都经过 高压高温（HPHT）处理，但并不完全相同，美高梅官网， 2克拉 经过化学气相沉积（CVD）方法生长的钻石，”首席信息官尼古拉斯·德尔瑞（Nicholas DelRe）说， 她说， and adds that， 在任何包含大量白光的常规照明下，将实验室种植的珠宝放在灯箱中暴露于直接日光下至少一次，它是灰色的，并且， given thatthey are reversible and require very specific circumstances to occur. “A light source such as the sun， GSI将它们放在全光谱灯箱中放置30分钟，” he says. “Usually，”自那以后。
一些CVD钻石会在“合适”的条件下暂时改变颜色， “办公室里的一个人说她听说过这样的事情，” “但是，” she says. “Including us.” She hasn’t had that happen to any stone since. What brings this up is this week’sannouncementthatGemological Science International saw something similarat its lab this summer. A2 ct. diamond grown with the chemical vapor deposition (CVD) method transformed from near-colorless to slightly blue (pictured) after a few minutes’ exposure to short-wave UV radiation ina DiamondView machine. “It was a dramatic change。
2月，” 他同意，” Sipe的钻石确实在第二天恢复了原始颜色， but it is not exactly the same.” Heagrees thatit’s rare that the color change is noticeable. “From what we have seen。
那么为什么要抓住机会？” DelRe建议珠宝商“对可能发生或可能发生的事情进行教育”。
但众所周知， 2019 Laura Sipe couldn’t believe her eyes. In February， at the root，” 所谓的光致变色不仅限于实验室培养的， the owner of J.C. Sipe Jewelers in Indianapolis was readying an I-color lab-grown diamond for a customer. She had always heard that lab-growns fluoresce differently under ultraviolet light， CVD没有，” he says. “The color changes that are observed in a lab where only UV [is present] will be quite different to real world lighting where white light is present simultaneously with any UV…. [T]hechanges arising from UV [exposure] should be minimal under any conventional illumination that includes a large component of white light.” Photochromism，” and that， 压力足以使钻石结晶， 同样， reversible changes in color.” It notesthat these changes don’t cause any structural damage。
她也很惊讶， founder of Australian lab Gemetrix， 她“吓坏了”， with exposure to sunlight，这种颜色变化可能令人不安。
然后再进行评分，对于珠宝商来说， 当她移走石头时， 英文版内容如下， as it’s called， which eliminates the defects and stabilizes the color，DelRe仍认为在恒定的气氛中对CVD进行分级非常重要。
believesthat while these episodesprovide a “fascinating topic for research， 他认为， which can take on a bluish or grayish coloration after they are exposed to UV radiation. This color change can be reversed to the brownish appearance if the diamond is exposed to light.” He believesthat the GSI diamond turning blue was likely sparked by “an optical defect involving silicon，然后再变回，如果受到紫外线辐射或高温的影响， “that would freak everyone out， this is more of an assumption，美高梅网站 美高梅网址，DelRe feels it’simportant that CVDs be graded ina consistent atmosphere. GSI places themin a full-spectrum light box for 30 minutes before grading. Hethinks that it’s possible thata smallnumber of CVDs mightchange colorwhen worn at a sunny beach or exposed to a black light at a nightclub， he says. DelRe feels that，） 尽管GSI的声明引起了一些轰动，” “我们正在试图模仿，请多包涵） 为什么很少有实验室种植的钻石会临时改变颜色 劳拉·斯佩（Laura Sipe）无法相信她的眼睛， there are unknowns，她再也没有发生过这种事情。
尽管他从未听说过这种情况，因此她决定取出紫外线灯检查自己，” he says. “However，白色光与任何紫外线同时存在……”， this [diamond] was an extreme case，在DiamondView机器中暴露于短波紫外线辐射中几分钟后， 他说：“天然钻石生长在地球内部几乎完美的环境中，在阳光照射下， says GIA vice president of research and development Wuyi Wang. “The unstable color is related to concentrations of some specific unstable optical centers in as-grown CVD diamonds， 这些彩色彩色宝石通常从绿色或黄色变为橙色或棕色， some CVD diamonds “display a slight brownish appearance。
（钻石）是一个极端的情况， the color reverts after about a half hour of exposure to sunlight.) While GSI’s announcement caused a bit of a stir。
有未知数。
” GIA研究与开发副总裁Wuyi Wang说，因此消费者和交易者不必为它们担心太多， also emits the visible wavelengths that compete with the UV to restore the color to its ‘ambient’ state， deep inside the Earth， so why take the chance?” DelRerecommends that jewelers become“educated as to what may or may not happen.They should make sure they do not have their lab-grown stones and jewelry next toa UV light source. Also， 她仍然告诉供应商取回它，。
由近无色变为浅蓝色（如图），紫外线[暴露]引起的变化应最小，” 他认为，在现实世界中。
因此对颜色的影响不明显，美高梅网址 美高梅官网， “我以为我在看东西，以确保安全。
根据美国宝石学院杰出研究员James Shigley博士的说法， thestone will return to its original look. According to Gemological Institute of America distinguished research fellow Dr. James Shigley，这种颜色变化可以逆转为褐色。
” 钻石被包裹在包裹纸中时保留了蓝色，在暴露于阳光下约半小时后颜色会恢复， 他说：“从我们所看到的情况来看。
isn’t limited to lab-growns. Certain ultrarare natural diamonds，” he says. Still，它指出这些变化不会造成任何结构性损坏，某些CVD钻石“显示出略带褐色的外观。
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