With a lot of red, this black opal from Lightning Ridge stands out at gem shows. Photo by Kevin Schumacher/GIA, courtesy Gerry Manning, Manning International.
Eric Stelzer has decades of experience mining boulder opal near Quilpie and continues to see the potential in searching for Australian opal. Photo by Andrew Lucas/GIA.
This opal shows play-of-color in a “rolling” manner and is primarily green and yellow in this position. Photo courtesy Cody Opal.
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。
.png "彩色钻石")
.jpg "了解校园课程和在线教育")
