Herkimer Diamond Grading

Herkimer Diamond Grading

AAA

Perfect. Very rare extremely hard to find.  Flawless to the naked eye from all angles.

No visible internal inclusions, cloudiness or contact marks.

Sparkling Water Clear.

AA

95% perfect. Nearly Flawless to the naked eye from all angles.

There are little to no visible internal inclusions, cloudiness or contact marks.

Sparkling water-clear.

A

90% perfect.  There are few minor flaws such as very small attachment marks and inclusions of the crystal that do not take away from the overall clarity of the crystal

Both termination points are present

sparkling water-clear.

B

75% perfect.  There are some flaws like larger contact or attachment marks, inclusions or fractures.

There may be small termination point damage.

Most of the crystal is still sparkling and somewhat clear.

C

60% perfect. These crystals have extreme cloudiness from internal fractures, larger attachment marks and inclusions.

There may be missing or damaged termination points.

All crystals should have at least one good termination point.

D

More than 40% of the crystal or crystal pieces will have flaws.

Very cloudy from internal fractures, large contact marks and inclusions.

Missing termination points.

 

 Source: http://sticksnstonesonline.com