Signed inside the ring : 750 51 O6123K. Ring size : US 5.75 (EU 51).Width of the band : 2.0 mm. Please ask any questions you may have. The item "CARTIER 18k tri-color gold narrow band Trinity ring size 51" is in sale since Sunday, March 1, 2020. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Precious Metal without Stones". The seller is "kiko173" and is located in aichi. This item can be shipped worldwide.