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<p>[QUOTE=&quot;2manybooks, post: 897955, member: 8267&quot;]2 useful books if you want to pursue this topic:</p><p><br /></p><p>Maggie Campbell Petersen: Gem and Ornamental Materials of Organic Origin. NAG Press, 2010. 9780719804212</p><p><br /></p><p>Michael Locke: <font size="4">Bone, Ivory, and Horn: Identifying Natural Materials. Schiffer Pub., 2013.</font></p><p><font size="4">9780764343070</font>[/QUOTE]</p><p><br /></p>

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