32	The Working of Precious Stones.
	or without facets at the base, it is said to be convex cut, (e.g Almandine Garnet). But when its faces are simply polished, it is said to be cut en cabochon, as in the Opal and Cat's-eye. In ancient times the Sapphire was always so cut, and sometimes the Emerald and Ruby are now so treated, especially for the Russian and occasionally for the American market A stone cut with a flattish convex surface is said to be tallow-topped.