Very dark stone--can it be turquoise?

Identifying & Discovering
1

I found this ring through an online auction. I think it’s really special in an understated way, so I passed it on to my son-in-law, who has similar characteristics.

I assume that the maker, Holgate, was Eugene Holgate, a Navajo artist. Please correct me if I’m wrong.

The central stone is very dark but has great depth. Is it turquoise? Or what could it be?
PS-photos are from the auction

Screen Shot 2019-12-07 at 6.39.56 PM
Screen Shot 2019-12-07 at 6.39.56 PM459×726 346 KB

Screen Shot 2019-12-07 at 6.40.23 PM
Screen Shot 2019-12-07 at 6.40.23 PM732×583 375 KB

Screen Shot 2019-12-07 at 6.40.12 PM
Screen Shot 2019-12-07 at 6.40.12 PM662×676 415 KB

Screen Shot 2019-12-07 at 6.40.49 PM
Screen Shot 2019-12-07 at 6.40.49 PM666×541 212 KB

Screen Shot 2019-12-07 at 6.40.38 PM
Screen Shot 2019-12-07 at 6.40.38 PM701×552 197 KB

8 Likes
2

It is a really interesting ring. Maybe it is something fossilized like dinosaur bone? Gem Quality 6.59 grams Agatized Dinosaur Gembone Fossil Cabochon

2 Likes
3

Jason, thanks for that information. It makes the ring even more fascinating.

4

That is a beautiful ring. I am stumped by the stone, but the overall workmanship is awesome!