Australia mines what percentage of the worlds opals?
Who discredited opal by naming it a ‘badluck’ gemstone?
Opal is formed from a mix of water and:
The area in Australia that holds the 3 major Mining fields is:
Black opal forms in:
Lightning Ridge is home to the:
The loss factor when cutting black and boulder opal is:
Which opal is naturally formed in Ironstone?
Boulder opal is estimated to run out in 5-10 years for what reason?
The earliest known opal artifacts found date back:
Why is it possible to see through crystal opal?
What is the loss factor of crystal opal?
Carat weight is the most important factor in opal:
What is the most valuable colour found in opal?
On the Mohs scale of hardness opal is:
Black opals can sell for more than diamonds:
Doublets are composed of:
Opals must avoid water at all times:
One of the most expensive methods of mining is:
Which is the preferred colour pattern in opal?
The water content in opal is between:
One of the opal fields in Queensland is:
Potch is rough black opal that must be cut and polished before it displays colour:
‘Opalus’ is the latin word for opal meaning:
Which opal is known as the ‘Queen of gems’?
Which opal has a more individual shape?
The opal with a crystal quartz cap is:
What are the 3 main things to look for when valuing opal?
Opal is the ‘badluck gemstone’:
What is a created opal?
The best way to buy opal is to:
Which of the following is not determinable by current gemological tests for opals?
Which of the following locations produces black opal?
The Specific Gravity (SG) and Refraction Index of natural and synthetic opal can fall within the same range:
In gemmological terms, which of the following is "fake opal"? (Meaning as opposite to a natural opal produced by the earth):
In trade terms, should opal that has been treated be considered “fake opal”? Treatments can include filling, dying, stabilizing, smoking.
Which of the following is not a requirement for a complete opal gemmological report?
Which of the following should be disclosed on a Certificate of Authenticity issued by Australian Opal Cutters?
The estimated retail value of an opal is stated on The Certificate of Authenticity:
What is the definition of a synthetic opal?
What is the definition of an imitation opal?
Which of the following locations produces hydrophane opal?
Brightness and N Rating are required for a gemmological gemstone certificate:
An N Rating will be required on ALL Certificates of Authenticity:
Which of the following defines precious opal?
Which of the following is not a classification of the current nomenclature?
Which of the following would be classed as a black opal on a gemmological opal report?
Australian Opal is considered the best opal in the world because:
Lab created opal is an opal simulant:
What is the most important function of the Certificate of Authenticity that you will be able to issue as financial members of Australian Opal Cutters?
The immersion testing method is used for determining:
Non-Synthetic Opal that has been filled or stabilised with resin or epoxies are considered:
Which of the following can change in hydrophane opal?
Yowah and Koroit Opal almost always is:
Certificate of Authenticity should always show the N rating of a stone:
What is currently used by Australian Opal Cutters to determine brightness of a stone?
The Certificate authorized by Australian Opal Cutters does not include which of the following?
In which location in Australia can you find black opals?
Which of the following would be classified as an assembled stone with the current nomenclature?
Members can issue a Certificate of Authenticity for opal fossils:
Members can issue a Certificate of Authenticity for rough opals:
Who bears responsibility for the accuracy of details stated on the Certificate of Authenticity?
A Certificate of Authenticity from Australian Opal Cutters cannot be issued for:
What is fire opal?
Which of the following is a crystal opal?
What N rating is considered black opal under the current nomenclature?
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