This is a stunning Lace Agate cabochon! It's in the collection because it split in two while I was cutting it, and I finally used it as a "repair" demonstration in a recent class at William Holland. There are visible chips in it as well (as a result of the damage), but it still looks good to me.

Dimensions: 37mm x 27mm x 6.5mm.  Weight: 43.00 carats.

This cabochon is in my personal collection; it is not available for sale.