GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
Read MoreThese red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.
Read More
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.
Read More
Lightning Ridge is the world capital of fine black opals, the most desired of all opals. In June 2015 a group of GIA field gemmologists visited this legendary town in New South Wales, Australia. Come with us to explore this important source of fine opals.
Read More
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah and Quilpie.
Read MoreOpal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.
Read MoreAfter almost 75 years of inactivity, the deposits of boulder opal in Queensland, Australia, began to attract new interest in the 1960s and 1970s.
Read More
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.
Read MoreA plastic imitation opal that shows true play-of-colour was advertised as "new" and offered for sale under the trade name "Opalite" at the Gem and Lapidary Dealers Association (GLDA) Tucson show in February 1988.
Read More
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Read More
