We have a lot of 3 stone pendants.  They were mixed in with a lot of vintage jewelry - I don't know if they are vintage or not, either way they are very pretty.  The purple one is wrapped in a silver tone metal and measures about 1 3/8" x 5/8", the black one is about 1 1/8" x 5/8" and the beige one has a gold tone metal top is about 5/8" x 3/8".  I don't know what type of stones these are.  They are in good gently worn condition.