grading information

There is some confusion about moissanite colour and clarity grading when compared to diamond grading.

Moissanite is not a diamond, it is a gemstone in its own right.

Strictly speaking, moissanite and other gemstones should not be graded using the diamond scale as this is specifically for diamond grading purposes. Some of the leading global suppliers of moissanite still describe the colour and clarity of moissanite in diamond grading terms, for example Charles & Colvard.

For clarity, the explanations below will assist with understanding the correct grading terminologies for moissanite.

Correct Terminology For Lab Grown Synthetic Moissanite Clarity Grading

Eye clean, very lightly included, lightly included, moderately included and heavily included.

Correct Terminology For Lab Grown Synthetic Moissanite Colour Grading

Colourless, near colourless, slightly tinted, tinted.

Moissanite is also available in yellow, pink (coated), green, cognac, and other colours are also available.

Use of diamond grading terminology.

Colour

Most people who have an interest in purchasing moissanite or diamonds do have some knowledge about the diamond colour (and clarity grading) range, so are more familiar with letters referring to colour than the correct gemstone terminologies of colourless and near colourless.

The internationally accepted standard when grading diamonds for colour is using the letters of the alphabet, from D to Z, D being the whitest (colourless) and Z by comparison, the most tinted/yellow.

Whilst it is clear that moissanite is simply not a diamond and moissanite should not be graded using the same terms as a diamond, the following explanation will provide clarity.

The correct terms to be used when describing moissanite should be colourless, near colourless, slightly tinted and tinted. Other colours like pink, blue, yellow and other colours are also available.

Some of the leading global suppliers of moissanite still describe the colour (and clarity) of moissanite in diamond grading terms, for example Charles & Colvard.

For the sake of simplicity and for ease of reference, and still used prolifically around the globe when describing moissanite colour, but not strictly speaking correct, and for purposes of approximate comparison, letters describing colour are sometimes assigned to moissanite.

So, where moissanite is referred to as DEF, these are regarded as colourless, and GH are regarded as near colourless.

Majestic Moissanite™ is sold in the colourless and near colourless range being DEF and GH respectively, as described in the paragraphs above.

Charles & Colvard® is sold in the colourless and near colourless range being DEF and GHI respectively as described in the paragraphs above.

Moissanite in tinted colours (more yellow) is available, but after decades of being in the forefront of the moissanite market, we have seen demand mostly in the colourless and near colourless ranges.

We are meticulously strict with the colour grading of the stones we offer for sale, to ensure that all the moissanite we supply falls well within the colourless to near colourless ranges as described.

Clarity

Diamond clarities are described as Flawless/Internally flawless, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2 and I3.

Flawless is self-explanatory, VVS1 Is very very slight inclusion and continues down the scale where I2 or I3 have obvious inclusions, which can be seen with the naked eye.

As previously mentioned, moissanite is not a diamond and moissanite should not be graded using the same terms as a diamond, however, the following explanation will provide clarity.

Internationally accepted standards when grading diamonds for clarity is as follows:

  • (FL) Flawless. No inclusions and no blemishes visible under 10x magnification
  • (IF) Internally Flawless. No inclusions visible under 10x magnification
  • (VVS1 and VVS2) Very, Very Slightly Included Inclusions, so slight they are difficult for a skilled grader to see under 10x magnification
  • (VS1 and VS2) Very Slightly Included Inclusions are observed with effort under 10x magnification, but can be characterized as minor
  • (SI1 and SI2) Slightly Included Inclusions are noticeable under 10x magnification
  • (I1, I2, and I3) Included Inclusions are obvious under 10x magnification and can be seen with the naked eye.

For the sake of simplicity and for ease of reference, and still used prolifically around the globe when describing moissanite clarity, but not strictly speaking correct, and for purposes of approximate comparison, diamond grading terms are used and assigned to describe moissanite clarities, for example, Flawless, VVS, VS, SI and I.

The generally accepted grading of a gemstone with few or no inclusions is termed ‘Eye Clean’. This means that when viewed with the naked eye, no inclusions are visible. Other terminologies used are very lightly included, lightly included, moderately included and heavily included.

Moissanite is created using organic elements, mimicking nature in a controlled environment. So, some moissanite gems have tiny, needle-like inclusions that can develop during the growing process of moissanite.

Inclusions in moissanite are not like inclusions within some other gemstones including diamonds.  Instead of dark/carbon spots that block light, moissanite inclusions (when visible) are mostly caused by micropipes (the lack of material).

Only moissanite that passes our stringent quality standards are made available for sale. We are meticulously strict with the clarity grading of the stones we offer for sale, to ensure that all the moissanite we supply falls well within the top clarities as described.

Majestic Moissanite™

Majestic Moissanite™ is available exclusively in clarities that are exceptional, and these gemstones are all eye clean, and for ease of reference and simplification and referring to the explanation above are IF-VS, where even with the industry standard 10x magnification, you would be hard pressed to find any flaws.

Charles & Colvard®

Charles & Colvard® moissanite is sold in the following grades:

  • Forever One IF-VS
  • Moissanite By Charles & Colvard® (MOI CC) SI-I2