Ring Sizes USA Size 5 = about 16mm diameter USA Size 6 = about 16.5mm diameter USA Size 7 = about 17.5mm diameter USA Size 8 = about 18mm diameter USA Size 9 = about 19mm diameter USA Size 10 = about 20mm diameter USA Size 11 = about 20.5mm diameter This beautiful 3 piece black ion plated or high polished stainless steel 2.50 ct AAA grade cubic zirconia wedding set is Amazing! Made of solid stainless steel and finished in high quality black ion plating. Engagement ring features a 1.25 ct (11x5mm) marquise cut center stone alongside 30 smaller round pave set stones. Matching wedding bands have 14 round stones each totaling 28 pave set stones. Total carat weight is approx 2.50 diamond equivalent. This set has Top quality stones and displays amazing enriched clarity just like real diamonds! Stainless Steel jewelry is durable, hypo-allergenic and will not tarnish or oxidize over time.