The Green Ring

I'm calling this " The Green Ring" because I'm not 100% sure on what the stone is.  I bought it from St. Nics Market in Bristol about 6 years ago and can't remember what it was, I'm guessing a Green Agate but 🤷🏻‍♀️ 
Anyway, I had a dig around in my scraps box and made this ring from bits of silver in it and this stone fancied it's airing I reckon because it suits it perfectly. 
It has so many shades of green light dependant, it's very gorgeous.
Just the one of these ever and it's a size L.
The ring is 1cm wide and 1.5mm thick reticulated Silver, the stone 10x14.