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<p>[QUOTE=&quot;Bronwen, post: 999408, member: 5833&quot;]The only one I would advise you against is the last one, the modern helmet shell piece, even though it is signed, unless she really really appeals to you and/or is really really cheap.&nbsp; I don&#039;t think she will hold value over time.</p><p><br /></p><p>First one is &#039;<a href="https://cameotimes.com/index.php/reference/materials-guide?start=2" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://cameotimes.com/index.php/reference/materials-guide?start=2" rel="nofollow">hardstone</a>&#039;, the generic term used for chalcedony (microcrystalline quartz) when it is used for gem engraving.&nbsp; The word &#039;onyx&#039; comes from the Greek for fingernail, which is what chalcedony looks like in its purest form.&nbsp; The color probably most people know best is cornelian/carnelian (orange - red); brown, especially when very dark, is called sard.&nbsp; A stone with layers of white &amp; dark brown is &#039;sardonyx&#039;.&nbsp; The word &#039;chalcedonyx&#039; is used for a stone like this one:</p><p><br /></p><p>[ATTACH=full]206485[/ATTACH] [ATTACH=full]206486[/ATTACH] </p><p><br /></p><p>Chalcedony does not occur in nature in black, it has to be dyed to that color; the Romans were already doing it. Although we use it that way all the time, it is not really accurate to call black chalcedony simply &#039;onyx&#039;.</p><p><br /></p><p>Cameos of this type continue to be made, so it is difficult to say how old the one in the necklace is.</p><p><br /></p><p>The second one is ivory, probably French.&nbsp; See similar here:</p><p><br /></p><p><a href="https://www.pinterest.com/cameotimescom/ivory-cameos-reliefs/mythological/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.pinterest.com/cameotimescom/ivory-cameos-reliefs/mythological/" rel="nofollow">https://www.pinterest.com/cameotimescom/ivory-cameos-reliefs/mythological/</a></p><p><br /></p><p>The coral Diana is probably somewhat earlier than the 40s, going by the type of safety clasp.&nbsp; From an investment point of view, this one is the best bet.&nbsp;&nbsp; The ivory presents the problem of what becomes of it in future, whether it can be resold or even given to someone who will be comfortable receiving it.&nbsp; Would you be comfortable wearing it now?&nbsp; My objection to the hardstone cameo is mainly that these &#039;noblewoman&#039; types are common, without the allure of a mythological or historical identity to go with them.</p><p><br /></p><p>In the end it comes down to personal preference &amp; finances.[/QUOTE]</p><p><br /></p>

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