Skip to content


Your cart is empty

Article: Diamond clarity

Diamond clarity

Importance and Factors of Diamond Clarity

  • Clarity is one of the four Cs of diamond grading (along with carat, color, and cut)
  • Inclusions and blemishes can affect the clarity of a diamond
  • Clarity grade is assigned based on the overall appearance under ten times magnification
  • Higher clarity grades are more valued, with Flawless being the most rare and expensive
  • Inclusions and blemishes can be used as unique identifying marks and proof of natural origin
  • Size, number, position, nature, and color or relief are considered in clarity grading

Types of Inclusions and Blemishes

  • Inclusions can be solids, liquids, or gases trapped in a diamond during formation
  • Inclusions may include crystals of foreign material or structural imperfections
  • Diamond enhancement procedures can also result in inclusions or blemishes
  • The GIA clarity grading scale categorizes diamonds based on the visibility of inclusions
  • Inclusions can range from minute and difficult to see to obvious and clearly visible

GIA Clarity Grading Scale and Procedure

  • The GIA clarity grading scale consists of six categories and eleven grades
  • Flawless diamonds have no inclusions or blemishes visible under 10× magnification
  • Internally Flawless diamonds have no inclusions visible under 10× magnification, only small blemishes on the surface
  • Very, Very Slightly Included diamonds have minute inclusions that are difficult to see under 10× magnification
  • Slightly Included diamonds have noticeable inclusions that are easy to see under 10× magnification
  • GIA clarity grading is performed under 10× magnification with darkfield illumination
  • Graders use binocular stereo microscopes equipped with darkfield illumination
  • The diamond is examined from different angles and lighting conditions to assess inclusions
  • Graders rotate the diamond to examine different sectors and use different lighting techniques
  • Final assessment is made using a 10× loupe before determining the clarity category and grade

Other Diamond Grading Organizations

  • The GIA clarity grading system is widely used in the industry
  • Other organizations such as the American Gemological Society (AGS) and the International Gemological Institute (IGI) also use the GIA system
  • Smaller labs may also adopt the GIA system for diamond grading
  • Consistency in grading systems allows for easier comparison and evaluation of diamonds
  • Different organizations may have slight variations in terminology and grading criteria

Clarity Enhancement and GIA Policy

  • Laser drilling and fracture filling are methods used for clarity enhancement
  • The GIA does not grade clarity-enhanced diamonds, but it will grade laser-drilled diamonds
  • If a GIA report mentions clarity enhancement or fracture filling, it is likely a counterfeit report
  • Fracture-filled diamonds typically have a significant price discount compared to untreated diamonds
  • Reputable vendors are required to disclose if a diamond has undergone clarity enhancement treatments
  • The GIA's grading standards ensure consistency and reliability in diamond assessments

Diamond clarity Data Sources

Reference URL
Knowledge Graph

Read more

Diamond (gemstone)

Introduction to Diamond Diamond is a well-known and highly sought-after gemstone. It has been used for decorative purposes since ancient times. The hardness of diamond and its ability to disperse l...

Read more


Properties and Thermodynamics Diamond is a solid form of pure carbon with a diamond cubic crystal structure. It has the highest hardness, thermal conductivity, and refractive index of any natural m...

Read more