Color Grades

By analysing the big data based on thouands of colored gemstone samples, the color grade is according to the characteristics of the gemstones of different categories, the brightness and saturation of the gemstones, according to the characteristics from deep to shallow.The color grade is up to "1#", the grades are successively decremented, and the colors are lighter in turn.

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Clarity Grades

By analysing the big data based on type, quantity and location of the inner inclusions of millions of gemstones, the gem clarity is graded according to the degree of influence of the inclusions on different types of gemstones.The gem clarity grade is up to "A+" and is decremented in turn.

  • A+ Flawless, Internally Flawless

    Inclusions are invisible under 10x magnification, and do not affect the appearance and transparency of gemstones.

  • A Very Slightly Included

    Inclusions are difficult to see under 10x magnification, and slightly affect the appearance and transparency of gemstones.

  • A- Slightly Included

    Inclusions are clearly visible to the naked eye, and affect the appearance and transparency of gemstones.

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Cutting Grades

* The main factors: Out of Round Girdle Outline; An Off Center Table; An Off Center Culet; Non-Parallel Table and Girdle. * The secondary factors:Misshapen Facets; Missing Facets; Extra Facets; Table is Not a Regular Octagon.

  • Ex

    Under 10x magnification, element features which affect the cut of gemstones are not visible.

  • VG

    Under 10x magnification, element features which affect the cut of gemstones are difficult to see.

  • G

    Under 10x magnification, element features which affect the cut of gemstones are obvious and slightly affect the appearance of gemstones.

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Grading Standard of Gemstones

According to the 4Cs of Diamond Quality and defined criteria, Jewel100 filtered thousand of samples considering their size, color, clarity and cutting.

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