Blog
Step by Step opal valuation - Examples
Step by Step opal valuation - Examples
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Karen Lindley AM
OPAL IN ETHIOPIA
OPAL IN ETHIOPIA
Don Hoover
Don Hoover
Laurie Aldridge
Laurie Aldridge
Boris Chauviré
Boris Chauviré
White Cliffs Opal Fields
White Cliffs Opal Fields
Neville Curtis
Neville Curtis
Lightning Ridge Opal Fields
Lightning Ridge Opal Fields
What is Black Opal?
What is Black Opal?
A historical discussion of Opal Mineralogy
A historical discussion of Opal Mineralogy
Opal and Mars?
Opal and Mars?
The Story of Hydrophane Opal
The Story of Hydrophane Opal
Sherman Archives - Early days in Coober Pedy ~ 1930's
Sherman Archives - Early days in Coober Pedy ~ 1930's
What is Boulder Opal?
What is Boulder Opal?
Sherman archives - early days in Andamooka
Sherman archives - early days in Andamooka
What is matrix opal?
What is matrix opal?
Opal Mining - The Australian way - the early days
Opal Mining - The Australian way - the early days
Opal Appreciation - Attributes of Precious opal
Opal Appreciation - Attributes of Precious opal
Science of Opal Symposium - 22 October 2021
Science of Opal Symposium - 22 October 2021
Opal in Brazil
Opal in Brazil
Opal Poetry, Art and Music
Opal Poetry, Art and Music
Paul Thomas
Paul Thomas
Bruce Dickson
Bruce Dickson
Opal in Indonesia
Opal in Indonesia
A discussion on Imitation Opals
A discussion on Imitation Opals
Opal NOMENCLATURE - Is there a need for review?
Opal NOMENCLATURE - Is there a need for review?
Gemmological Classification
Gemmological Classification
ABC Radio’s Nightlife
ABC Radio’s Nightlife
European Opal or .. Opal in Slovakia
European Opal or .. Opal in Slovakia
The International Opal Academy is the home of Opal appreciation. As a movement of Opal romantics we see the magic in the uniqueness of each opal and strive to preserve the intriguing story of this precious gemstone. (2).png
Literature
Chemistry Techniques used in researching opal - Neville Curtis
A discussion on Ethiopian Opal from our french colleagues.
African Opal Unearthed
Play-of-Colour Opal from Wegel Tena, Wollo Province Ethiopia
The Origin of Digit patterns
Ethiopia: A new source of Precious Opal
WHITE CLIFFS-CRAM
The White Cliffs Royal Commission
White Cliffs Opal Field- A report by NSW Geological Survey
White Cliffs Opal Fields a commentary by Gwen Rowe
OPAL CARVING-DANIELA L'ABBATE
EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL
HISTORICAL FOLKLORE-KOSMINSKI
Trace Elements in Black Opal
More on opal and cracking
New information - Slovakian opal
Porosity of some opaline siliceous materials
The Role of water in the cracking of opal
AN Historic document: the Occurrence of Opal at Lightning ridge and Grawin.
An analysis of Opal Polymorphs: Opal-AG, Opal-AN and Opal-CT by NMR
A Review of the mineralogical opal classification
SYNTHETIC OPAL
Trace Elements in Australian Opal-1
Historical opal literature - an extract from Dana's Mineralogy
An Extract from the Thesis of Boris Chauvrie
GILC and LMHC decisions for Hydrophane opal nomenclature
Opal Historical SA Trade standards (1979)
Opal Nomenclature - AG1997
The Story of European Precious opal from Dubnik
The White Cliffs Opal Field, NSW