If you are reading this article, it is a virtual certainty that you own a cameo or two, or 300, that you bought on line, with only photographs and the seller’s assertions on which to base your decision whether to buy or not. This article offers tips on how to recognize different cameo materials and how to distinguish those that look very similar one from the other. Because there appears to be a strong need for this information, the article is being put up as a work in progress.