彩色宝石、钻石和珍珠检测的世界领导者
您的宝石让我们为您检测
- 快速运输和安全的门到门交付
- 在曼谷、香港和美国进行现场鉴定
- 简单的订单和安全的信用卡支付方式
- SSEF鉴定报告*
*验证您的SSEF鉴定报告并下载副本：www.myssef.ch
成为宝石专家
自2001 年成功开课以来，SSEF 的教育部门已经为来自工业、贸易以及学术界的数千名学生提供了各类宝石学课程。了解我们的课程
- SSEF提供的免费中文在线课程。
- 高级课程（英文授课）
- 团队量身定制课程
SSEF的免费在线课程
了解宝石
通过这些介绍性的在线课程，开始你成为一个宝石专家的旅程。
Led light boxes for standardized lighting of coloured stones and diamonds
In the past, coloured gemstones and diamonds were often examined in natural daylight, but reproducing such specific lighting conditions was challenging. Some impractical methods had been suggested, like grading only during specific hours or facing northward, especially during cloudy weather.
At the frontier of research: irradiation experiments on corundum
As is known in the gem trade, the colour of certain gems may be caused or influenced by the presence of colour centres (a type of defect in the crystal structure that can absorb light and thus result in colour, that can be present both in stable or unstable form).
Purple love
It is always a pleasure for our team to analyse gemstones which are not so common, or sometimes even very rare, but which may compete in beauty and quality (but often not in hardness) with the most prestigious classic gemstones.
Dark purple chrysoberyl
Since about three years, we see at SSEF occasionally chrysoberyl samples of very dark purplish to purplish brown colour, sometimes of quite impressive size (>10 ct). Based on chemical composition, these chrysoberyls show distinct concentration of chromium, but no evident change of colour, thus do not fit the criteria to be called alexandrite