NWOT Herkimer Diamond Ring. Size 6. I mined this ring at the Herkimer Diamond Mine in Herkimer, NY. The diamond is not perfect as it has a small spotted mark. The band is a size 6, sterling silver. It has a pretty shine and some texture to it. I had the ring created there at the Artisan Center. One of a kind, handmade. Would make a great promise ring, engagement ring or wedding ring.