This 4.33-carat Lightning Ridge black opal is the center stone in a ring that won grand prize at the 2015 JCK Jewelers’ Choice Award. Photo courtesy Omi Privé.
Expedition guide Terry Coldham fishes some yabbies out of a pond on the Stelzer mine. Photo by Andrew Lucas/GIA.
Former miner Eddie Maguire amazed the team with his art that included sculpture and opals. Photo by Andrew Lucas/GIA.
This black opal has red, blue, and green play-of-color in a jigsaw pattern. Photo courtesy Cody Opal.
At the Australian Opal Centre in Lightning Ridge we discovered the opal teeth that were proudly displayed by the late Harold Hodges, an eccentric and passionate figure in opal history. Photo by Andrew Lucas/GIA.
Colin Stelzer（科林·施特尔策）使用一台挖掘机仔细去除矿井壁的薄层，而他的父亲 Eric（埃里克）则打开核桃石寻找砾岩蛋白石。 摄影：Andrew Lucas（安德鲁·卢卡斯）/GIA。
GIA 的实地宝石学家 Andrew Lucas（安德鲁·卢卡斯）在 Yowah（犹瓦）蛋白石矿场拍摄照片。 摄影：Tao Hsu（许焘）/GIA。
All the opal mining areas had expert cutters like Jeremy Lomax. Lomax cuts for many of the miners in Lightning Ridge and used to mine himself. Many of the miners also cut a percentage of their rough. Photo by Andrew Lucas/GIA.
Black opal can show a rainbow of colors. Photo by Robert Weldon/GIA, courtesy Richard Krementz Gemstones.
Splitting open the ironstone revealed the boulder opal inside. Photo courtesy Cody Opal.
.png "彩色钻石")
.jpg "了解校园课程和在线教育")
