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:
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