Wedding Ring : WR02 Size(Diameter): 18.2mm; Gems: Blue Saphire 14x10mmx6.5; Format: STL; Recommended Material: White gold, Silver, Platinum
How open STL format: File -> Import -> *.STL All Printable or 3D programms work with stl formats.
How open STL in Zbrush: Plugins -> 3D print -> STL import.