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<p>[QUOTE=&quot;Bronwen, post: 701164, member: 5833&quot;]Seller should have said &#039;sardonyx shell&#039;, a casual name for helmet shell (<i>Cypreacassis</i>) when it has a dark brown layer instead of a brighter orange layer.&nbsp; The 2 that are used most are <i>C. rufa</i> &amp; <i>C. madagascariensis</i>.&nbsp; You will also see the term &#039;carnelian/cornelian shell&#039; (as well as &#039;cameo shell&#039;), as Jivvy surmises, because of the color resemblance.</p><p><br /></p><p><br /></p><p><br /></p><p>Just so.&nbsp; When cut from a large enough shell, a section of helmet shell can be so flat as not to require a curved mount, and the color is so much the same as stone, they are visually indistinguishable from the front.&nbsp; See 2 examples in the middle of this article:</p><p><br /></p><p><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">https://cameotimes.com/index.php/reference/materials-guide?start=2</a></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie51" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie51" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie51" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie51" alt=":hilarious:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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