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<p>[QUOTE=&quot;Vector, post: 9724085, member: 83864&quot;]Thank you for your observations. I&#039;ve examined the piece closely. I believe there might be a slight indication of undercutting. My understanding of undercutting is that it typically occurs with a large background, allowing for efficient removal of big pieces using a sew. However, I&#039;m not sure if the background is large enough and worth applying the sew.</p><p><br /></p><p>Some other features maybe help to identify. </p><ul> <li>The carving details? I&#039;m not sure which part to focus on other than the undercutting or identical mold.</li> <li>The thickness of this cameo (background) is less than 2mm, which seems uncommon for lava.</li> <li>And there is a shell-like fracture surface on the edge of its back, so it is a manufactured piece. The difference between agate and glass can be distinguished through the fracture surface; the former is usually uneven, while the latter is shell-like. This difference arises from their different crystalline nature, which may also apply to lava and artificial lava.</li> </ul><p>[ATTACH=full]472126[/ATTACH] [ATTACH=full]472123[/ATTACH] [ATTACH=full]472125[/ATTACH] [ATTACH=full]472124[/ATTACH][/QUOTE]</p><p><br /></p>

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