We set a 4mm round White Opal Cabochon in this Size 6 Sterling Silver Ring.  This is a gem that is curved on top and flat on the bottom.
 
We'll be shipping this item in a very attractive Gift Box and include a matching tote bag and crinkled paper. You'll be ready to present this gift in only a few minutes. All buttoned up, pretty, and sophisticated.
 
Shipping is FREE!