次のタイプで宝石を見る：
器具類
記者発表の検索結果
A Useful Technique to Confirm the Hydrophane Nature of Opal
Observing a water drop’s interaction with opal, as well as refractive index, can confirm a specimen’s hydrophane nature with less risk of breakage than total immersion.
Winter 2012 Gem News International
Fall 2012 Gem News International
Dyed Purple Hydrophane Opal
Opals with an unusual purple bodycolor and strong play-of-color have recently appeared in the market.
遊色効果を持つエチオピアWollo（ウォロ）州Wegel Tena（ウェゲルテナ）産オパール (英語)
A new opal deposit was discovered in 2008 near the village of Wegel Tena, in volcanic rocks of Ethiopia’s Wollo Province.
Fall 2002 Gem News International
Spring 2000 Gem News International
Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
エチオピア、シェワ地方産オパール (英語)
Opal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.
クイーンズランド州のボルダーオパール (英語)
After almost 75 years of inactivity, the deposits of boulder opal in Queensland, Australia, began to attract new interest in the 1960s and 1970s.
.jpg "YMAL GIA Ed")
