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Opal Grading

A black opal is a natural solid gemstone with a black or nearly black body tone.

Opals in the N1 to N4 range on this scale are considered black opals - of course attracting a
higher price associated with this class of opal.

The brightness of color is based on the following scale.

1	Opal has color but is fairly dull
2	Opal has color but nothing special
3	Opal has good color at arms length
4	Opal is bright and color is crisp and sharp at arms length
5	Opal is brilliant and color jumps out of the stone at you at arms length

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