Copper pendant marked only with a star

by Helen
(Provost, AB, Canada)

I have a copper tone necklace & pendant that has a star marking on the back of the pendant. The pendant is a rectangle with green, yellowish green and golden colored stones (squares, circles & diamond shaped). It has 3 round stones stacked onto the rectangle where it is attached to the chain. The chain is also copper colored with 2 pearls on each side of the pendant.

Have you ever seen this marking and what can you tell me about it? Thanks