I'm not sure, sorry I don't have enough info. I won this off Listia, it's a beautiful ring but when I got it I realized it was too small for my fingers. There is no markings inside the ring, so I'm pretty sure it's not real gold. As far as the gem, I don't know anything about them. But the ring is in perfect condition; no scratches or marks on gem or band!
Your very welcome and Thank you my friend. I forgot to say this is a pretty ring daughter would love to show this off. If mama does not decide to keep it if I win LOL. :o)