Tiffany & Co. Sliver Ribbon 18k Yellow Gold Ring Size 4.5. Introducing the Tiffany & Co. Silver Ribbon 18k Yellow Gold Ring, a captivating blend of elegance and charm. Material: This exquisite ring is crafted from a combination of sterling silver 925 and 18k yellow gold, creating a stunning contrast that's both classic and modern. Size: The ring is a size 4.5, offering a perfect fit for those with this ring size. Hallmark: Tiffany & Co 925. Condition: The ring has been professionally polished to shine like new, ensuring it looks its best when you wear it. Includes: It comes with the original Tiffany Pouch and a complimentary gift box with a bow, making it an ideal gift for various occasions.