Future Fortune 18K Yellow Gold Love Potion Locket Necklace with Blue Sapphires and Diamonds. Love Potion Locket, bezel set heart shaped blue sapphire, blue sapphire baguette, sparkling stardust finish, with pavé set diamond bail. Inside of locket is a bezel set heart shaped diamond surrounded by a stardust finish. Sapphire weight: 1.37 carats. Diamond weight: .40 carats. 18" Rolo chain with 16" adjustable loop. 18k gold 20mm round locket. Available in 18k yellow