Opal miners call this structure of boulder opal bubbles. Photo by Andrew Lucas/GIA.
Maguire blends elements from many cultures to create his boulder opal works of art. Photo by Andrew Lucas/GIA.
Raleigh Henderson uses divining rods to search for signs of boulder opal at his mine in the Yowah area. Photo by Andrew Lucas/GIA.
Boulder opal is concentrated toward the core of this nut. The specimen was polished for collectors. Photo by Andrew Lucas/GIA.
This black opal shows some very bright colors in its pattern. Photo courtesy Cody Opal.
This opal miner near Yowah almost looks like he would have fit right in during the settlement period of the western United States. Photo by Andrew Lucas/GIA.
Moore takes a moment to enjoy life in his home in the outback. Photo by Tao Hsu/GIA.
Boulder opal miner Mark Moore displays one of the boulder opals showing seams of color in the dark ironstone matrix he cut from his mine’s production at Koroit. Photo by Andrew Lucas/GIA.
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.
.png "彩色钻石")
.jpg "了解校园课程和在线教育")
