彩色寶石、鑽石和珍珠檢測的世界領導者
您的寶石讓我們為您檢測
- 快速運輸和安全的門到門交付
- 在曼谷、香港和美國進行現場鑒定
- 簡單的訂單和安全的信用卡支付方式
- SSEF鑒定報告*
*驗證您的SSEF鑒定報告並下載副本： www.myssef.ch
成為寶石專家
自2001年成功開課以來，SSEF瑞士珠寶研究院教育部門對數以千計來自產業、經貿以及學術界的學員提供了特別企劃的專業寶石學課程。
瞭解我們的課程
- SSEF提供的免費中文在線課程。
- 高級課程（英文授課）
- 團隊量身定制課程
SSEF 提供的免費在線課程
了解寶石
通過這些介紹性在線課程開始您成為 gem 4expert 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