Our Herkimer Diamond Solitaire Ring features a crystal clear double terminated quartz gemstone. Each stone has an organic cut, unique to each ring giving this piece an organic, one of a kind style. We hand-select each stone for its beautiful clarity to include in these rings.Each Herkimer gemstone varies in size and shape. If you have a preference for a larger or smaller stone, please indicate that below. 1/4" to 3/8" Herkimer Gemstone Genuine Clear Quarts from Herkimer, NY mine. Available in Sterling Silver or Tarnish Free 14k Gold Fill Nickel Free and Hypoallergenic Natural gemstones bring unique beauty to every piece and deserve a little extra care. To help preserve their color and quality, we recommend reviewing our Gemstone Care Guide before wear.