Hi Nancy, Yes and no. Yes, there are Cypraea tigris in which the dorsum is one solid color. However, that color consists of the same pigment that normally forms the spots (think of it as being so heavily spotted that the spots fuse into a uniformly colored surface. Such specimens are quite rare. Unfortunately, the purple-top specimens you describe are not rare at all, and also are not natural. They are made by buffing or dissolving away the outer layer of shell, to expose the purple underlayer. Cypraea caputserpentis and Cypraea arabica are often sold in this condition as well - in tourist shops, not by specimen shell dealers! Regards, Paul M.