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Diamond Grading Course

We Offer Professional Diamond Grading Course

Application of Natural Diamond Grades

The general rule for selecting the appropriate diamond grade is that the harder the rock, the better the diamond toughness and crystal geometry should be. For example, the selection of the “AAA” or “AA” grade would be appropriate for use in a hard, consolidated granite formation while the selection of the “P2” or “P3” grade would be appropriate for use in a limestone or sandstone formation.Dia grading

Kicker Grade

This is a special grade of diamond that is applied exclusively as gauge diameter setting below the bit face on surface-set diamond bits and casing shoes. The inherently low crystal strength of Kicker grade diamond makes it unsuitable for bit face setting but is more than adequate for use in wear protection applications on the set diameters of drill bits where there is little load on the diamonds. Kicker grade diamonds range in shape from angular or elongated to completely amorphous. Their coloring is variable and they frequently possess fissures, cracks and inclusions.

All surface-set diamond bits manufactured by Dimatec are available with one of eight standard grades of natural drill diamond set on the cutting surfaces of the bit face. The diamond grades are described as follows:

AAA Grade

Premium quality natural drill diamond. These stones are round to octahedral and dodecahedral in shape and may have small amounts of internal inclusions with no cracks or fissures.

AA Grade

High quality natural drill diamond. These stones are mainly round with a small percentage of off-shaped stones and somewhat spotted as well as crystal shaped stones.

A Grade

Medium quality natural drill diamond. These stones have a generally blocky shape with somewhat broken surfaces and sharp edges. Many have fissures, inclusions and minor surface cracks.

E Grade

Economy quality natural drill diamond. These stones are commonly referred to as “casting” grade. They have an irregular blocky shape with broken surfaces and sharp edges. Many are spotted and may contain semi-flat and naturally cleaved stones.

P1 Grade

High quality mechanically processed (rounded) diamond. These stones have a high lustre finish. They are mainly clear white to gray/white in color with a varying percentage of clear brown stones. All stones are fully processed with an absence of fissures and cracks.

P2 Grade

Medium quality mechanically processed (rounded) diamond. These stones have a high lustre to satin finish with a varying degree of color with no greens, blacks or dark yellows. Although these diamonds are fully processed, the surface texture of these stones may exhibit some irregularities but are free of any fissures and cracks.

P3 Grade

Economy quality mechanically processed (rounded) diamond. These stones have a high lustre to satin finish with a high degree of color. Stones may be round to elongated with a smooth to irregular surface texture. Minor surface cracks may be present with no internal cracks or fissures. This grade is commonly used as diamond setting on reaming shells and other stabilizing tools.

Carbonados

Rough4These stones are sometimes referred to as “black diamond” and are an opaque, gray/black cryptocrystalline aggregate of diamond crystals, graphite and amorphous carbon. Carbonados usually occur as relatively large, irregular shaped crystalline structures that are mechanically split into angular shapes and desired sizes. Normally, individual carbonado crystals are sized in the range of 10 stones per carat (SPC) or larger. Bits set with carbonados are particularly well suited for use in drilling softer formations.

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