Black and Smoky
Herkimer Diamonds


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The mineral black hydrocarbon creates the smokiness.

Black Herkimer Diamond

Double terminated quartz crystals.

Black diamond with good clarity.

The smoky Herk has great clarity.
Pictures above of the 2 largest Herks



Four C Grade Raw Quartz Crystals

Length: 8 - 15.5 mm
Width: 5.5 - 10 mm
Weight: 14 ct. / 2.8 g total

The 4 black and smoky Herkimer Diamonds are pictured in sets of 2; two largest gems above, two smaller are pictured below.
A black and/or smoky Herkimer Diamond is defined as a Herkimer quartz crystal with a good amount of black material contained in the gem. Traditionally, this black material was called Anthraxolite. A relative of anthracite (coal), decayed plant material that fossilized.
However, new evidence suggests this smoky black material was caused by hydrocarbons verses anthraxolite. A hydrocarbon is a thick oily substance. The new theory suggests that hydrocarbons moved through the cracks and vugs along with dissolved quartz, salt and other minerals. At some point these fluids solidified, providing the areas to grow Herkimer Diamonds. This black substance can also be found in the pockets surrounding the Herkimer's. Two of these crystals would be considered black diamonds, and 2 of them smoky gems. Sizes & descriptions:

  • 8.25x5.75x4 mm / 1.1 ct. - double terminated smoky crystal with good clarity.
  • 11.5x5.5x4 mm / 1.36 ct. - raw double terminated black diamond with elongated shape and a smoky bridge crystal.
  • 11.5x5.5x4 mm / 4 ct. - a smoky quartz with black hydrocarbon both inside and out.
  • 15.5x10x8.5 / 7.5 ct. - a true black Herkimer Diamond.

This is such an interesting group of black and smoky Herkimer Diamonds, we are including a loupe (picture below) to really appreciate them.

Price: US$ 37.00
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Pictures of 2 smallest Herkimer smokies.
Diamonds weigh 1+ ct. each

C grade Herkimer Diamonds

Black Herkimer crystal

One is a bridge crystal.

Smoky Herkimer Diamonds

10X loupe included



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