A vintage 1957 Petri (stamped) platinum (stamped) diamond engagement ring! This beautiful ring features a center diamond weighing 3/4ct, and measuring 5.7x3.5mm. This diamond is LM in color, and SI2 in clarity. There are 8 separate round diamonds as well, weighing .15ctw. This ring is dated to 1957. The ring size is 6.5. Measures 1/4" lengthwise on top of the finger. Weighs 5.1 grams.