Blue topaz ring in 18k white gold with diamonds

Blue topaz ring in 18k white gold with an approximate 6.40 carat blue topaz surrounded by approximately 0.36 carats in round diamonds. Ring size 4. Top of ring measures 18mm x 16mm. Bottom of shank is 5.6mm.

This Topaz ring is currently size 4 and some items can be sized up or down, please ask! It weighs 10.9 pennyweights and is 18k White Gold.