Uneek Round Blue Sapphire and Round Diamond Eternity BandDivine duos of meticulously matched round blue sapphires alternate with solo round diamonds in this strikingly unconventional eternity band; crafted, this pretty piece is designed to go with your sapphire and diamond engagement ring, but looks gorgeous with an all diamond ring, too; the model pictured here has 3. 45 mm round sapphires and diamonds; there's 12 sapphires with a combined weight of 2. 20 carats, and 6 diamonds with a combined weight of 0.