OPALS GLOSSARY
Fire Opal – A term used for that opal where the base color (as distinct from the diffracted color) has red or orange tone. This material usually comes from Mexico.
Flagstone – A pattern having defined patches of color with the appearance of flagstone paving. Less regular than harlequin.
Flaw – Mark or impurity which devalues the stone.
Crazed – Network of cracks across an opal.
Diffraction – The breaking up of bean of a white :light causing spectral colors.
Doublet – A layer of light opal attached to a black background; simulates black opal.
Fan Harlequin – Color pattern of tiny squares in a tan shape.
Fire – Refers to the diffracted color play of an opal.
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