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<p>[QUOTE=&quot;Bronwen, post: 9600225, member: 5833&quot;]Properly it should be specified as black onyx.&nbsp; The word &#039;onyx&#039; comes from the Greek for fingernail, so, unless your fingernails are very dirty, the term properly belongs to the white layer.&nbsp; The black layer has been dyed.&nbsp; The field has not produced a term like cornonyx for ones like your lady.&nbsp; </p><p><br /></p><p>There&#039;s virtually no consistency in how hardstone materials are described.&nbsp; Then there are ones like the Francescangeli bacchante I showed above that are sardonyx but have had the back &amp; edges dyed black.</p><p><br /></p><p>Think I&#039;ve posted this before, but can&#039;t hurt to have a refresher.&nbsp; This is an agate geode showing the effects that can be produced on chalcedony with various coloring treatments.&nbsp; The (a) section is untreated.</p><p><br /></p><p>[ATTACH=full]465615[/ATTACH][/QUOTE]</p><p><br /></p>

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