Amazon.com : 40 Pieces Rhinestone Crystal Twisters Set 。Gorgeous hairpins perfect for that special occasion this season or if you just want to add something special to your updo for date night. Hand-cut Herkimer diamonds are wrapped in sterling silver on brass pins. Length is approx. 3\" long. This listing is for a set of 3. Handmade in the USA from a woman-owned, small business! Herkimer Diamonds are beautiful double-terminated quartz crystals found in Herkimer, New York. Incredibly, these phenomenal gemstones are close to five hundred million years old. The crystals are magnificent works of nature, found in the rock, having a diamond-like geometrical shape.