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Gem and Ornamental

Gem and Ornamental

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178 GEMS AND ORNAMENTAL MAlXRlMS OF ORGANIC ORIGINFigure 10.10Sphy oyster &ell*: natural d polished.Intricate carving <strong>and</strong> cutting of nacreous shell into hark hasbeen used for many articles such as boxes <strong>and</strong> fans.Shells of sacient thickness, which have layers of different colours,can be carved into cameos. The periosmcum, <strong>and</strong> possily theouter shell layer are removed, so that the top layer of the wrvingutilisea the white middle layer of ahell, <strong>and</strong> the coloured inner layerof the shell provides the background for the cameo. Sometimes theouter shell layer is left as an integral part of the design (Figs 10.1 1<strong>and</strong> 10.12).Very thiclc shell can be cut <strong>and</strong> made into beads. Beads from shellswith alternating colour layera (such as the conch), or with nameous

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