14k White Gold and Natural Diamonds Nickel Alloy Free Measures 4mm Guardian/Locking Back Diamond Specs: H/I Color, SI1-SI2 Clarity, .4 total carats, 2 diamond pieces This pair of diamond earrings comes equipped with guardian locking earring backs as added security to prevent loss. The backs are easy to remove by pushing the two buttons on either side to unlock when removing. Attempting to pull the back off without releasing the lock could damage your earring post.