Gorgeous and unique Maltese Cross with Intaglio Stones necklace.

This is a wonderfully unique piece. It is a brass tone ornate chain that measures 18 inches. I acquired this necklace without a clasp. I had my jeweler replace the clasp with a similar tone of brass and I think he came very close. The pendent is the star of the show and is quite heavy. It measures 2 1/2 inches. It has 5 large stones with Intaglio carving and then 4 smaller green stones I am guessing the stones are carnelian, onyx, and jade. However, I am not certain and I forgot to ask my jeweler to identify. This is a stunning piece and is vintage.