What is this made of?

THe only cameo in these images is the female head on the fuchsia background, which appears to be polymer clay. Hard to tell from the photo what the head is made of. Traditionally, cameos are raised carvings in banded onyx cut so that the raised part is a different color (usually whitish) from the background.

The big flower clasp on the pearl necklace is made of mother-of-pearl and/or other shell. I can't imagine why the seller calls it a cameo.

Georgia

Cameos are also carved in seashells (the exact type of which eludes me at the moment) which have a pinkish background overlaid in white. Wedgewood pottery also made a line of cameos in their trademark ceramic. The main proprty of a cameo is that it is carved (or cast) out of a material that has two different colored layers, and that the carving is either a portrait or a scene.

Perhaps the vendor of the "cameo" clasp mistook carved black lip shell for the shell-type cameo. Black lip doesn't have layers and isn't carved into a portrait, and so any carving would not be considered cameo.

(Fire Mountain carries these carved shell components in various sizes and in several different shells: black lip, gold lip, paua, and mother-of-pearl. Your favorite bead catalog probably has them, too.)

Arondelle

(Where's Harry when you need him?)

The first photo is a Mother of Pearl flower - made of carved leaves... this is not a cameo...

The second photo - the thing in the center is not a true cameo either - it is intaglio (reverse carved glass or plastic - hard to tell which)

The "flowers" you like on the second piece appear to be enameled metal flowers...

Cheryl