Exceptional Spessartine Garnets
first published in Facette 21 (February 2014) In 2013, […]
顏色不穩定的–貌似帕帕拉恰的彩色剛玉
最近在馬達加斯加發現的彩色藍寶石表現出不穩定的顏色。經顏色穩定性測試（Colour Stability Test），寶石顏色從粉橙（貌似帕帕拉恰Padparadscha-like）變成粉紅。本文將介紹貌似帕帕拉恰的彩色剛玉及其顏色的不穩定性。
GemTOF Analyses of Sapphires from Madagascar and Kashmir
In the beginning of 2017, gem testing laboratories started to receive cut stones from a new area for gem analysis and issuing reports. As stated in a trade-alert by SSEF in early 2017, some of this new sapphire material may resemble internal features of Kashmir blue sapphires, therefore careful microscopic inve
ทับทิมที่พบน้ำมันเชื่อมประสานรอยแตก
พลอยที่มีรอยแตกหรือร้อยราวภายในส่วนมากมักนำมาปรับปรุงคุ […]
Exceptional Colour Change Garnets Showing the Usambara Effect
by Dr. M.S. Krzemnicki, first published in Facette 21 ( […]
အက်ရာအတွင်း ဖြည့်စာထည့်ထားသော ပတ္တမြားများ
ဤအကြောင်းအရာမှာ အမှန်တကယ်ပင်ရိုးရှင်းသော ကိစ္စဖြစ်ပေသည် […]
Sapphires from Ambatondrazaka, Madagascar
Madagascar, an island of many gem treasures, saw in recent months another ‘sapphire rush’ after the discovery of a new gem deposit about 35 km east of the small town of Ambatondrazaka.
Sapphire from Andranondambo, Madagascar
first published in Facette 22 (February 2016) In 2 […]