Are Herkimer Diamonds Real Diamonds? A Silversmith’s Guide to the Crystal That Grows Its Own Facets.

Some stones arrive already finished.

No stone cutter. No polishing wheel. No one deciding what they should become. A Herkimer diamond spends millions of years in the dark, shapes every one of its own faces, and comes out of the rock sparkling. If you have ever held one, you know why people can’t stop touching them.

Quick Answer

No, Herkimer diamonds are not real diamonds. They are naturally double-terminated quartz crystals from Herkimer County, New York. They earned the nickname by coming out of the rock already sparkling, with 18 natural faces and no cutting at all. A Herkimer is a real, natural crystal with a Mohs hardness of 7, and it is one of my favorite energetic stones to set in silver.

A note from the Ship Shop Studio

Hi, I’m Erin, the ginger fairy pyro behind Twisted Ginger Jewelry. I’m a self-taught silversmith with nearly two decades of obsession with silver. I work from the Ship Shop Studio, a 19-foot converted shipping container on Mitkof Island in Southeast Alaska, where the rain is constant and the light is precious.

I first wrote about Herkimers in 2024, when customers kept telling me they couldn’t stop touching theirs.

Since then, so many of you have added Herkimer earrings, necklaces, and now rings to your growing Twisted Ginger collections.

The same questions keep landing in my inbox, too. Are they real diamonds? Where do they come from? Why do they sparkle like that without being cut? Is the piezoelectric thing real? So I rebuilt this guide from the ground up, with the geology, the science, a few delightfully strange facts, and straight answers from my bench.

In this guide: what a Herkimer is, how it compares to a diamond, where it grew, what’s hiding inside, the real science, what it means, how to choose a Herkimer diamond ring, and how to care for it.

What is a Herkimer diamond?

A Herkimer diamond is a naturally double-terminated quartz crystal found in and around Herkimer County, New York, in the Mohawk River Valley. Double-terminated means it has a point on both ends.

Most quartz grows anchored to rock at one end, so it only finishes one point. Herkimers grew free-floating inside small pockets of stone, so nothing stopped them from finishing both points.

A classic Herkimer has 18 faces: six around the middle and six on each point. Nobody cut them. They come out of the ground that way, often so clear you can read through them.

You may also hear them called Middleville diamonds or Little Falls diamonds, after two of the New York towns where they turn up.

Are Herkimer diamonds real diamonds?

No. A diamond is pure carbon. A Herkimer diamond is quartz, which is silicon dioxide. The “diamond” in the name comes from their water-clear sparkle and natural facets, which look remarkably like a cut gem straight out of the earth.

That doesn’t make them fake. A Herkimer is a real, natural crystal. It simply belongs to a different mineral family, and it got to its sparkle by a completely different road.

Herkimer diamond vs. diamond: which belongs on your hand?

A diamond is the stone of a promise someone else makes to you. People choose, cut, and shape it until it fits an idea of what precious should look like.

A Herkimer is a different kind of promise. It made itself. Every facet grew on its own, slowly, in the dark, with no one watching. When you wear one, you are not wearing someone else’s idea of your worth. You are wearing a crystal that never needed permission to shine.

A few practical differences matter too:

• Sparkle. A cut diamond throws hard, fiery flashes. A Herkimer has a softer, water-clear glow with natural facets that catch the light from every side.
• Story. A diamond’s shape comes from the cutter. A Herkimer has its own shape, which means no two are alike.
• Wear. At a hardness of 7, a Herkimer is durable enough for everyday wear in a protective prong setting. It asks for a little more care than a diamond, like anything natural and unaltered.
• Price. Herkimers are far more accessible than mined diamonds, so you can wear something rare and natural without waiting for a milestone or a person to make it happen.

Where do Herkimer diamonds come from?

Herkimers live in a layer of upstate New York rock called the Little Falls Formation, also called the Little Falls Dolostone. Their story runs in three long chapters.

1. The sea (about 500 million years ago). During the Cambrian Period, sediment settled in a shallow sea off the edge of the ancient Adirondack Mountains. Over time, it hardened into the rock that would one day hold the crystals.
2. The pockets. Buried deep, water slowly dissolved the rock in places, leaving small hollow pockets geologists call vugs.
3. The crystals (much later). During the Carboniferous Period, mineral-rich water at around 200°C seeped into those pockets. Quartz grew there slowly, suspended and undisturbed, and emerged exceptionally clear, with a point on each end.

The part I love most: the crystals are younger than the rock that holds them. The stone made a home first. The light moved in later.

Herkimers became widely known in the late 1700s, when workmen cutting into the Mohawk Valley dolomite started finding them in large numbers. They have been treasured for more than two centuries since.

Double-pointed quartz grows in other places too, and some of it gets sold as Herkimer diamond no matter where it was mined. Many sellers call those stones “Herkimer-style.” True Herkimers come from Herkimer County.

Eight delightfully strange things about Herkimer diamonds

1. They grew floating. Most crystals grow attached to rock. Herkimers formed suspended in pockets, which is how they finished both points.
2. Every facet is natural. All 18 faces formed on their own. No human hand shaped a single one.
3. They’re younger than their home. The rock is about 500 million years old. The crystals grew inside it much later.
4. Some glow. Herkimers with petroleum inclusions can light up orange under a blacklight.
5. Some hold ancient water. A few carry sealed pockets of fluid, sometimes with a bubble that slides when you tilt the stone.
6. They scratch glass. At a hardness of 7, quartz is harder than ordinary window glass.
7. They’re cousins of your watch. Herkimers are quartz, the same mineral that keeps time inside a quartz watch.
8. They answer pressure. Squeeze quartz, and it makes a tiny electric charge, a property discovered by the Curie brothers in 1880.

What’s inside a Herkimer diamond?

Many Herkimers hold inclusions, tiny pieces of the past sealed in while the crystal grew. Jewelers sometimes treat inclusions as flaws. I treat them as fingerprints. These are the ones you’re most likely to find:

• Black hydrocarbon (anthraxolite): small dark flecks of ancient carbon, and the most common solid inclusion in Herkimers.
• Fluid bubbles (enhydros): pockets of liquid trapped during growth. Some hold a gas bubble or a speck of carbon that moves when you tilt the stone.
• Petroleum inclusions: golden droplets that can glow orange under UV light.
• Multi-phase pockets: bubbles holding liquid, gas, and sometimes a tiny crystal, all at once.

Inclusions are why no two Herkimers look alike, and why no two Lumen rings ever will.

Do Herkimer diamonds glow under a blacklight?

Some do. A Herkimer carrying petroleum inclusions can glow a warm orange under UV light, like a tiny ember hiding inside clear glass. Not every stone has them, which makes finding one feel like a secret. If you own a Herkimer, try it with a blacklight flashlight in a dark room. You may discover your stone has been keeping a light of its own.

Are Herkimer diamonds piezoelectric?

Yes. All quartz is piezoelectric, and Herkimers are quartz. Squeeze the crystal and it makes a small electric charge. Run electricity through it and it flexes, just slightly.

Pierre Curie and his older brother Jacques discovered the effect in 1880. “Piezo” comes from the Greek word for squeeze. And it is very much real:

• It keeps time on your wrist. In a quartz watch, a tiny quartz crystal vibrates exactly 32,768 times per second.
• It changed watchmaking. Seiko released the first commercial quartz watch, the Astron, on Christmas Day 1969.
• It went to war. One of its first practical uses was sonar during World War I.

Where the science ends matters too, so I’ll tell you plainly. The pressure of your hand on a ring makes only a tiny charge, and it vanishes almost instantly. So when people tell me their Herkimer feels grounding, or that they can’t stop touching it, I hear that as their own experience with the stone, not a lab result.

Both things can be true. The physics is fascinating, and so is the way people bond with these crystals.

What do Herkimer diamonds mean?

In crystal traditions, Herkimers are associated with clarity, amplified intention, and attunement. Many people who work with crystals think of them as high-vibration stones and keep them close for focus and calm.

My customers put it in simpler words. They tell me they feel more grounded and more like themselves when they wear one.

I named my ring Lumen, the Latin word for light, for the same reason. A Herkimer makes its own facets in the dark and comes out of the earth already whole. That felt worth wearing on your hand.

Why a Herkimer diamond ring?

Some light is not given. It is grown.

Maybe you have spent years being the steady one. Carrying something invisible. Waiting for someone to notice the work, the weight, the light you have been making all along. Waiting for the title, the apology, the ring someone else was supposed to choose.

A Herkimer diamond ring answers that waiting in a few quiet ways:

• You don’t have to wait to be chosen. This is the diamond you give yourself, on your own timeline, for your own reasons.
• It’s real in every sense. A natural crystal, never cut, never treated, carrying 500 million years of story in its host rock.
• It’s yours alone. No two Herkimers grow the same way, so no one else will ever wear your exact stone.
• It keeps you company. People reach for these crystals on hard days. A ring puts one where your hand can find it.
• It sparkles without asking permission. Water-clear and faceted by nature, it catches the light every time you move.

It is a talisman for the person who stopped apologizing for wanting something beautiful that was only ever for them.

How do I choose a Herkimer diamond ring?

The best Herkimer diamond ring protects the crystal’s points and lets light in from every side. Look for these four things:

1. A secure prong setting. Prongs hold the crystal without hiding its natural faces. Every Lumen ring uses four.
2. A natural, untreated stone. A true Herkimer doesn’t need cutting or coating to sparkle.
3. A maker who chooses the stone for the setting. Every crystal has its own shape, so the fit matters as much as the sparkle.
4. Solid silver you can wear daily. Sterling and fine silver hold up to real life and develop a soft glow with wear.

How to wear Herkimer diamond jewelry

Herkimers are easy to live with. Their clear sparkle reads as both quiet and bold, so they work with flannel and rain boots as well as they do with something dressier.

• As an everyday ring. A protective prong setting makes a Herkimer ring a daily companion. Take it off for heavy lifting, gardening, and anything that could knock the points.
• As a statement piece. A single Herkimer in sculptural silver carries an outfit on its own. Let it be the one thing that catches the light.
• As a stack. Pair a Herkimer ring with simple silver bands for contrast between raw crystal and clean metal.
• As a self-gift with meaning. Wear it on whichever hand feels like yours. There is no rule about which finger a diamond you give yourself belongs on.

Can you layer Herkimer diamond jewelry?

Yes, and I design for it. Herkimer pieces layer beautifully with my Signature Silver Line and with other stones from the Raw Crystal Collection. If you’re anything like me, you’ll want as many crystals as you can fit over your heart.

How do you clean Herkimer diamond jewelry?

Use a polishing cloth on the silver only, and skip the water bath. Herkimers are hard, but their raw points have natural fracture lines, and the prongs holding them are delicate.

• Use a jeweler’s polishing cloth on the silver, working carefully around the prongs.
• Wipe the stone with a dry, soft cloth when it picks up fingerprints.
• Skip ultrasonic cleaners, steam cleaners, and silver dips.
• Take your ring off before lotion, hand sanitizer, and cleaning products.
• Store each piece in its own zip bag so the points don’t scratch your other jewelry, and so the silver tarnishes more slowly.

My full sterling silver care guide covers everything else, including why your jewelry should never live in the bathroom.

Written by Erin Kandoll, the ginger fairy pyro behind Twisted Ginger Jewelry. Erin is a self-taught silversmith with nearly two decades of obsession with silver, working from her Ship Shop Studio on Mitkof Island in Southeast Alaska. Her work has been featured in Canvas Rebel magazine, and Twisted Ginger exhibits at the JA New York trade show and the Anacortes Arts Festival. Reach her anytime at erin@twistedginger.me.