- Emerald cut cubic zirconia stud earrings - Platinum-plated (Rhodium) , 925 sterling silver - Cubic Zirconia, 925 sterling silver body and earring post, hypoallergenic stainless steel butterfly - Stone size: 4*6mm We chose the highest grade of emerald-cut cubic zirconia for these stud earrings. Emerald cuts are square-shaped with stepped facets, this elegant cut is more subtle than our other cuts in that it doesnt sparkle all the time, however the flashes of lights are much stronger and beautiful.