Opal from West Java, Indonesia
Description of Indonesian opal reportedly from West Java.
Opal from the Shewa Province, Ethiopia
Opal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.
Shenzhen: The Frontier of China’s Gem and Jewelry Industry
All jewelry professionals are familiar with the city of Shenzhen, a global jewelry manufacturing center and a leader of China’s fast-growing gem and jewelry industry. Join the GIA team as we tour the city and discover more about its leading jewelry brands.
Splendor in the Outback: A Visit to Australia’s Opal Fields
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
Thai-Myanmar Petrified Woods
The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
Opal from Querétaro, Mexico: Fluid Inclusion Study
The distinctive orange-to-red “fire" opals from Querétaro have not been found in significant quantities at any other locality.
Chrysoprase and Prase Opal from Haneti, Central Tanzania
Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.
Queensland Boulder Opal
After almost 75 years of inactivity, the deposits of boulder opal in Queensland, Australia, began to attract new interest in the 1960s and 1970s.
Opals from Opal Butte, Oregon
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
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.