After reading the eye candy section I decided for my girlfriend''s birthday that I would get her one. I bought this setting which was not to expensive.and seem to be a recomend ebay seller for semi-mounts. Here is the setting I want to put some kind of a colored stone in there. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270567375407&ru=http%3A%2F%2Fshop.ebay.com%3A80%2F%3F_from%3DR40%26_trksid%3Dp4712.m570.l1313%26_nkw%3D270567375407%26_sacat%3DSee-All-Categories%26_fvi%3D1&_rdc=1 It says it fits a 7.5mm round stone. Does that mean I should be looking for 7.5mm exact? Or slightly smaller/bigger to ensure it fits ? I want to buy a well cut stone that will really stand out on her finger! Please help