I just love the absolute quality of this pin! It is not marked but tests to 14k using the acid method. The pin is 1 inch across and has a beautiful Mississippi fresh water river pearl with beautiful lustre and fine nacre. The pearl is hard to measure but it is approximately 12mm by 6mm. The old European cut diamonds are very high quality and are 2mm in diameter. The enamel is in nice condition with some small wear on a few places, not to distract. The pin catch has been replaced with a locking catch and it has been soft soldered onto the back. he old pin catch is where the Krementz signature would have been. There is a swivel bale so that this can also be worn as a pendant. There is also a hook so you can wear a watch or a favourite charm or locket. C. 1900.