Opal Stone – Natural, Faceted, Green
With trace amounts of uranium compounds, this hyalite opal is slightly radioactive and fluoresces under ultraviolet light. Photo by James…
With trace amounts of uranium compounds, this hyalite opal is slightly radioactive and fluoresces under ultraviolet light. Photo by James…
Black opal, 16.42 cts, from Lightning Ridge, Australia. Photo by Daniel Mekis. Licensed under CC By-SA 3.0.
A great find. © Bonanza Opal Mines, Inc. Used with permission.
A contraluz opal from Mexico, illuminated from back (approximately 4 cts). Photo © Joel E. Arem, PhD, FGA. Used with permission.
A contraluz opal from Mexico, illuminated from front (approximately 4 cts). Photo © Joel E. Arem, PhD, FGA. Used with permission.
Semi-black opal: Australia (approximately 10 cts). Photo © Joel E. Arem, PhD, FGA. Used with permission.
1.47-ct Barion emerald-cut opal, Lambina Mines, Australia. © Dan Stair Custom Gemstones. Used with permission.
Resin opal. Photo by Aisha Brown. Licensed under CC By-SA 2.0.
Prase opals. Photo by Aisha Brown. Licensed under CC By-SA 2.0.