Queensland Opal Fields: Home of the Unique Australian Boulder Opal
Boulder opal is becoming more and more popular. Australia’s central Queensland is home to more than a dozen of sources of this stone. Come with GIA field gemmologists to find out more about this unique gem.
Splendour 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.
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.
Treated Andamooka Matrix Opal
Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly colour enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia.
Abstracts; Summer 2009
This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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.