I’m consulting my experts as to what these stones are I’m almost sure the yellow is egg tool amber it’s a lovely BROOCH and the artist also made an area for you to wear as a necklace. I added the sterling chain. That’s how I love to wear this item. I’m selling many of my inheritance because I don’t wear some any more. Your gain. Also I have several by this artist. It’s a TLC signature and also what looks to me like a CHICKEN air maybe some other signature. I haven’t ever been able to get that artist name BUT it’s a SPLENDID work of art for sure !!! I have a few so check all of the listings.