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昆士兰砾背蛋白石 (英语)
After almost 75 years of inactivity, the deposits of boulder opal in Queensland, Australia, began to attract new interest in the 1960s and 1970s.
Treated Andamooka Matrix Opal
Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly color enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia.
"Opalite": Plastic Imitation Opal with True Play-Of-Color
A plastic imitation opal that shows true play-of-color was advertised as
Opals from Opal Butte, Oregon
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.
Summer 1986 G&G Lab Notes
This section, from the Summer 1986 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
Unusual Bodycolors ofPrecious Opal
Two stones with unusual bodycolor are identified as precious opal.
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