Math and science rest on evidence and provable hypotheses. Shoot-from-the-hip guesses and gut checks just don't cut it here. On this necklace, one hand-stamped tag reads "Q.E.D." and the other has the word "PROVE". The tags are hung back-to-back, so one word will always be showing. A white pearl accents the combination, which comes on an 18" silver ball chain. The tags are made from aluminum, immune to oxidization, and (like a good proof) virtually indestructible. Note: each piece is individually hand stamped and will thus vary slightly from the photo. We think this adds to its charm.