Unusual, Bright and very very green. This Opal has shades of Green with Blue as well. Set in Silver with a nice wide bail so you can put it on a thick chain or rubber/leather band. The Opal is 6.30ct, 26x18mm and has an N5 body tone, which means it is rated as a Grey Opal (having Grey coloured Potch on the back). Very impressive piece.