A to Z Minerals & Rock Shop




Herkimer Diamonds





More coming - inquire if interested in a specific type of size and we'll see if it's in our warehouse.



The "Herkimer Diamond" locality is situated in the center of New York State, located in the Little Falls, the Mohawk River in the rolling foothills of the Adirondacks.  Geologically, the precambrian meta-sedimentary Grenville formation was intruded by large masses of syenite.  After subsidence during the cambrian, the syenite became a base for marine sediments - basically CaMg(CO3) 2 with silica and organic mater.  These sediments later because the Little Falls dolomite in which the quartz crystals were formed.  Most of the crystals are found in a narrow belt extending from Little Falls in the south to Salisbury (Diamond Hill) and Middleville in the north, although the doubly terminated crystals are found as far away as Lake George, some 50 miles to the northeast.


The largest "Herkimer Diamond" on records, measured 14 inches along the c axis and was found at Nose Mountain, Fonda in Fulton County NY.  The highest quality crystals are in the Little Falls and Middleville area.    The reason for so many doubly terminated crystals is somewhat of an enigma to geologists.  One possibility is a nearly simultaneous crystallization of calcite and then quartz in the dolomite cavities and pores.  Many crystals are still found within eroding calcite and many freshly opened pockets contain dozens of loose crystals showing no point of attachment .  Many pockets are covered with a black shiny nitro gent contained hydrocarbon called anthraxolite.  Occasionally flakes of anthraxolite can be found floating on water bubbles within a a clear doubly terminated quartz crystal.



(click on any mineral to enlarge)


Herkimer Diamond Set (6)

variety grade & size, 1/2 oz. ttl
$35.00 USD -


Herkimer Diamond w/ side car formations
yellow tint, odd shape
19 grams, 36x28x18mm

$50.00 USD


Herkimer Diamond

Med. size, tiny matrix left

35 grams, 33x25x36mm
$55.00 USD - SOLD



Beautiful shape, clarity level, points

8.5 grams

$40.00 USD- SOLD


Herkimer Diamond

Amazing Stone

8.5 grams, 30x15x10mm

$47.00 USD - SOLD


Herkimer Diamond

perfect for pendant, near flawless

$25.00 USD - SOLD


Herkimer Diamond Set (2)

beautiful stones, very clear

4 grams ttl

$16.00 USD - SOLD


Herkimer Diamond

One side w/med. size keyhole, good clarity, great for pendant, 4.7 grams

$26.00 USD - SOLD


Herkimer Diamond

A2Z's favorite, great shape, amazing clear

10 grams

$55.00 USD - SOLD


Herkimer Diamond

Great point, fracture from larger stone, clear, great pendant

30 grams. 43x34x32mm

$38.00 USD - SOLD

Herkimer Diamond

Some fractures & chips

8.5 grams

$18.00 USD - SOLD


Herkimer Diamond Giant

2 lbs.
$200.00 USD 


Herkimer Diamond, med size, clear w/keyhole

5.7 grams, 22x21x12mm
$31.00 USD -


Herkimer Diamond, Med. slight damage 1 side, other clear

9 grams, 29x18x17mm
$36.00 USD -


Herkimer Diamond

Most clear, some cloudiness, roundish shape

9 grams, 28x20x16mm

$40.00 - SOLD


Herkimer Diamond

Round shape with side car, cloudiness, great palm stone

46 grams
$30.00 USD


Herkimer Diamonds, pendant size

4 grams, 21x15x11m
$28.00 USD -


Herkimer Diamond Set (10)

small stones, mixed grade

10 grams, 21x15x11m

$35.00 USD - SOLD

Herkimer Diamonds Set (3)

Small yellow tint, 4 grams ttl
$22.00 USD - SOLD


Herkimer Diamond

Grade AA

5 grams 8x6mm
$33.00 USD -


Herkimer Diamond Set (2)

4 grams ttl, 16x10x7mm

$20.00 USD - SOLD


Herkimer Diamond

3 grams, 17x13x14mm

$16.00 USD - SOLD


Herkimer Diamond Sm. cluster

4 grams, 19x14x14m

$24.00 USD - SOLD


Herkimer Diamond

Lg. beautiful clear stone w/great edges & points

8.5 grams

$38.00 USD - SOLD

Herkimer Diamond, Lg.

11 grams, 29x27x12mm
$33.00 USD -


Herkimer Diamond

Grade B, med size, some chips

7 grams, 30x15x10mm

$20.00 USD


Herkimer Diamond

B grade, med size, some chips

6 grams, 30x15x5mm

$18.00 USD


Herkimer Diamond

Clear, great shape & points

2 grams

$10.00 USD - SOLD


Herkimer Diamond Set (5)

9 gram ttl

$44.00 USD - SOLD



Herkimer Diamond


4 grams, 20x16x14mm
$25.00 USD  - SOLD


Herkimer Diamond

Great shape & points, clear

2 grams, 14x12x11mm

$12.00 USD - SOLD


Herkimer Diamond

3 grams, 18x12x10mm

$16.00 USD - SOLD

Herkimer Diamond

3 grams, 17x12x10mm

$20.00 USD - SOLD


Herkimer Diamond w/ side-car
Interesting and colorful in light
43 grams 48x41mm

$55.00 USD -


Herkimer Diamond

2 grams, 17x9x9mm
$15.00 USD

Herkimer Diamond

2 grams, 17x11x10mm

$18.00 USD - SOLD


Herkimer Diamond

2 grams, 17x11x10mm

$18.00 USD - SOLD


Herkimer Diamond

2 grams
$18.00 USD -


Herkimer Diamond

lg. stone, some flaws, cloudy

rainbow colors in light

43 grams, 40x40x20mm

$40.00 USD - SOLD


Herkimer Diamond, X sm.

3/4 grams, 12x9x6mm
$tbd USD -


Herkimer Diamond, great shape and clear slight inclusions

2 grams, 18x13x9mm
$20.00 USD -


Herkimer Diamond, odd shape pendant size

9.5 grams, 26x20x16mm

$33.00 USD - SOLD


Perfect shape, clear, amazing stone

3 grams, 20x15x15mm

$18.00 USD - SOLD


Herkimer Diamond

Big mostly clear shard

18 grams, 50x40x30mm
$35.00 USD -


Good clarity, interesting shape, few inclusions, nice wrapping stone

3.3 grams, 15x10x10mm

$14.00 USD - SOLD


Crystal clear, great shape & points

2 grams, 18x13x7mm

$12.00 USD - SOLD


Great shape & points, parts a bit cloudy, others clear clarity

8 grams

$35.00 USD


Herkimer Diamond Set (10)

18 grams total
$81.00 USD - SOLD


Herkimer in Matrix

$25.00 USD


Herkimer in Matrix

$30.00 USD

Herkimer Diamond in Matrix


Herkimer Diamond in Matrix, org. Middleville, NY, 2.7 oz., 62x32x32mm, $10.00 USD

Herkimer Diamonds in Matrix, org. Middleville NY


Herkimer Diamond in Matrix, org. Middleville, NY, 2.1 oz, 45x40x21mm, $10.00 USD


Because of the volume of minerals and internet bandwidth issues, we have elected to show one, or two, photos of each mineral for sale; however feel FREE to ask for additional pictures before you order.  We are happy to send you additional pictures of all angles.  We'll show you the good and the bad, and when necessary microscopic views.  So just ask.   Do you want a microscopic view of  your mineral? (click here)





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Please be sure to post the inventory number, a short description and price. 

We will confirm your order before shipping.


Tidbits:   Herkimer Diamonds are said to be the most valuable and clearest of all quartz and are sought after by collectors.  We are lucky to be near the mines here in New York.  Metaphysically, these stones are known as "attunement" for Reiki and other practices.  They are said to be stones of inner vision and useful in dream work, energy work and meditation.   They, like quartz, can be programmed with your thoughts and wishes. 



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