Sz 5.25 Vintage Sterling Silver Rings Lot of 3. Selling the three, all between sz 5 and 5.25. All from the last half of the 20th century. Opal, royston turquoise, and Onyx, all sterling but only the onyx one is marked. Most rings are shown on a a ring sizer in the pictures and the size is typically given at the beginning of the title and description. Women's Size 5 Ring.