Crystals.com
Herkimer Diamonds
Authentic natural minerals, thoughtfully sourced and individually photographed.
Herkimer Diamond Crystals for Sale
Herkimer diamonds are not diamonds at all — they are doubly-terminated quartz crystals (SiO₂) found in exposed dolostone outcrops in and around Herkimer County, New York. What sets them apart is their natural geometry: unlike most quartz, which grows attached to a matrix and terminates on one end, Herkimer diamonds form freely in solution cavities, producing two naturally faceted terminations and exceptional water-clear transparency. They formed roughly 500 million years ago during the Cambrian period.
Forms & Characteristics
Single-terminated crystals display the classic Herkimer brilliance — clean faces, sharp edges, and glass-like clarity. Double clusters feature multiple crystals growing from a shared pocket, often with interesting contact points and secondary growth.
Matrix specimens show Herkimer diamonds still seated in their original dolomite host rock, preserving the geological context of formation. Some pieces contain inclusions of anthraxolite (black carbon) or fluid-filled enhydro pockets, adding collector interest.
What We Carry
We currently stock 8 Herkimer diamond pieces, including loose double-terminated crystals, clusters, matrix specimens, and jewelry. Every piece is photographed individually — what you see is what you receive. See also our quartz collection and new arrivals. Free shipping on orders $150+.
Let customers speak for us
LOVE IT. Colors are absolutely beautiful, the fit is perfect, and I'm so glad to say that I'm happy with the size of the crystals - I was afraid I wouldn't like to smaller size as I'm used to 8 mm.
This necklace is beautiful. They were out of it, but I love the substitution. All their jewelry is beautiful.
Love it so much! Looks and feels wonderful.
It's incredibly beautiful. Love that different aspects of it are highlighted in different lighting - in a bright setting you see a million tiny quartz on top that you would never know were there in the lower lighting setting. My favorite is the amazing combination of sections that sparkle and sections that are smooth and gleaming. Looks and feels wonderful. Perfectly packed too.
Love the scent, it's wonderful, and thank goodness for it as it gets rid of the odors that come in from outside, and is healthy because of the materials. Looks nice too.
Smells dreamy, is super relaxing, and is healthy because of the materials. Looks nice too.
A Sanctuary of Natural Beauty
Every crystal here was discovered by hand, selected with intuition, and photographed in its true light.
One-of-a-Kind. Forever Pieces.
Let the Universe Decide
