Opal characteristics Opal classification Types of opal Varieties of opal Body tone Transparency Play-of-colour Brightness Pattern Shape and face Origin


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Opal Lexicon

Opal Brightness (Brilliance of fire)

The brightness of an opal (also termed brilliance) considers the brightness and clarity, the amount and density as well as the directionality of the play-of-colour and is rated on a scale from 1 to 5:

Level 1: FAINT

Opal shows play-of-colour only under sunlight.

Level 2: DULL

Opal shows some dull play-of-colour under sunlight or spotlight.

Level 3: BRIGHT

Opal shows a nice play-of-colour under sunlight or spotlight.

Level 4: VERY BRIGHT

Opal shows a nice play-of-colour under low light and a very good under sunlight or spotlight.

Level 5: BRILLIANT

Opal shows a bright crisp mirror-like play-of-colour under sunlight or spotlight and often seems even brighter in subdued light.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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