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Generally opals with a black or dark body tone are more valuable than those with a white, light, or crystal body tone, because a stone with a darker body tone tends to display colours more vibrantly. Black opal is the most prized opal and may realise prices over AUD $15,000 a carat.
Opal Value. Evaluating precious opal is a highly refined art. For details, see our articles on Appraising Opals and our Opal Buying Guide. The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services. Opal Value via Gem Price Guide. Black Opal, tone N1 to N4
19 Apr 2016
However Boulders often have more denseness and brilliance than gems from Lightning Ridge at a more competitive price. Boulder gems often have ironstone inclusions in the foreground which reduces their price but in the opinion of many, add to the personality of the stone. Video of high grade black boulder opal.
This chart is used when green or blue is the primary play of color against a dark background such as Lightning Ridge Australia Black Opal. Blue Green Black crystal when held to light can be seen through. Large sheets (patterns) of blue or green bright color may be valued at higher prices, called "broadflash". Note - These
Opal gemstones are evaluated a little differently than other gemstones. The International Gem Society opal price guide features a grading system and terms unique to opals. A full description of these differences can be found in our Premium article on Appraising Opals. For the benefit of those interested in opal buying, here
Gemstone standard prices per carat, Fire Opal value charts. Average market prices updated monthly.
11 Jul 2017 Our guide to the 10 factors that determine the value of an Opal. From color, to brightness and even origin we will walk you through it all.
The book "Australian Precious Opal - A Guide Book for Professionals" by Andrew Cody (See Books Section on this website) is an interesting guide to the range of opals and their prices, especially the price difference between light and dark, though this information is now a little dated as prices have changed significantly
A photographic guide for the confusion of names that are frequently used to describe opals. The best opals can command prices per carat that rival expensive diamonds, rubies and emeralds. Opal is one of the Although opal is found throughout the world, almost all of that opal is common opal of very little value. Most of

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February 2018