What were the jewel/locket transforming toy dolls from the 80s/90s?

Not sure how else to describe them -- which is probably why my random searches of variations of the above is turning up nothing ;) -- but these were little colored plastic "jewels" that opened like a locket to reveal a doll.

Not a separate toy, like Polly Pocket, though the concept was similar. Instead, the jewel portion was the body, and her little plastic arms, legs and flat head folded in and stored inside the locket. I think they had strings to wear them as necklaces and came in circles, triangles, squares, etc.? The shapes themselves were maybe 1-2 inches ... not very big.

Anyone have any clue what those were called?