I found this supplier of reconstituted stone materials that are absolutely perfect for inlay...

Recon Stone / Tru-Stone

These are in 1/4", 1/8" etc....

Recon-Stone-Imitation-Semi-Precious-Stone.jpg image009.jpg a20791e143b11568c0ab90_l.jpg

and artificial ivory too - Alternative Ivory col.849/TM
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