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<p>[QUOTE=&quot;Bronwen, post: 4397603, member: 5833&quot;]Indeed?&nbsp; Good to know.&nbsp; Guess I don&#039;t really look at that much jewellery that isn&#039;t antique.&nbsp; Certainly agate is readily dyed.&nbsp; In my field of cameos, most that are described as sardonyx have had the background layer dyed.</p><p><br /></p><p>Segment a of this geode slice shows the natural coloration; the other wedges have each been given a dye treatment.</p><p><br /></p><p><br /></p><p>[ATTACH=full]371370[/ATTACH] </p><p><br /></p><p><br /></p><p>You have posted the selection from yesdirt faster than I could finish this.</p><p><br /></p><p>Quartz can be macrocrystalline (like amethyst) or micro/cryptocrystalline.&nbsp; If a microcrystalline quartz is translucent, it is called chalcedony; if it is opaque, it is called jasper.&nbsp; When chalcedony is a shade of orange, it is called carnelian (cornelian).&nbsp; When chalcedony develops into certain formations it is called agate.&nbsp; Layered/banded/ribbon agate is the main one, but there are also things like moss agate that have been given that designation.&nbsp; Agates are not a different mineral than carnelian.&nbsp; It is all chalcedony.&nbsp; Green chrysoprase is another example.</p><p><br /></p><p>I should have said chalcedony is so plentiful there is no reason to use some other mineral to mimic carnelian.&nbsp; The Romans already knew how to change the color.&nbsp; What I suppose you could politely call &#039;enhancement&#039; has been so routine for so long, it is no longer considered necessary to disclose it.&nbsp; As the yesdirt article says, you should assume a carnelian has been treated unless proved otherwise.</p><p><br /></p><p>I think as long as you do not represent the beads as mined/natural, you are on firm ground.</p><p><br /></p><p>These must feel heavy around the neck, no?[/QUOTE]</p><p><br /></p>

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