How to Check Defects in Diamonds?

Diamonds are dotting thing and are a sure alluring element in the world of jewellery. Diamonds are no doubt one of their kinds but jewellery lovers often tend to commit blunders while purchasing diamond jewellery. Yes it is undeniable fact that buying diamonds is puzzling job to do. Identifying the real diamonds and verifying their originality is a cumbersome task for which one needs to aware of its flaws and blemishes. Diamond is the most precious and most desirable stone but it is sure to have defects and blemishes. These defects are of many types like visual and on surface.

What makes a diamond so valuable, precious and desirable? Diamonds’ radiance is the perfect answer for all. This flawless and colorless stone emits breathtakingly alluring. Diamond’s price is set by four ‘C’s which include, Carat, Color, Clarity and Cut.

Carat (Weight): Carat which is known form of measuring the weight of diamonds is a unit of weight equal to 1/5th of a gram or 1/142nd of an ounce. Small diamonds cost less than the larger ones of same quality.  This is dependent of the availability of diamonds; small ones are easily available as compared to the bigger ones.

Color: To the amazements, colorless diamonds are the most precious ones.  Most gem quality diamonds range from yellow to colorless.  Known as fancy diamonds, these colorless diamonds top the price chart among all diamonds.

Cut: The craftsmanship, cut and mold of diamond plays a vital role in deciding the rates of diamond. Not only the geometric appearance of the stone but also the stone’s luster and fire of diamonds make it precious. In fact the way a diamond is shaped plays important role in emitting the perfect fiery prism of diamond.

Clarity: An ideal diamond is scratch-less and spotless. More clarity leads towards high price of diamonds.

Any deficiency in any of these characteristics of an ideal diamond leads towards the flaw and further appraisal of diamond which actually should be kept in mind to estimate the correct price and value of diamonds. Visibility related flaws are called inclusions and surface related flaws are called blemishes. Light marks do not affect diamond’s performance and structural integrity but larger clouts can distort diamond’s structure and design.

Though diamonds with higher clarity are preferred and most valued and priced but sometimes small scratches and shadows are also good for the design of diamonds as few of them make diamond’s surface look fascinating. Major types of defects include Inclusions and blemishes.

What are Inclusion & Blemishes?

Inclusion sort of defects are majorly related to black, white and other colors and these sports are temporary and are result of finding minerals inside diamonds . Being related to the internal part of diamonds, these defects are named as inclusions. Given below is the list of few common inclusions:


  • Clouds
  • Feathers
  • Included crystals or minerals
  • Knots
  • Cavities
  • Cleavage
  • Bearding
  • Internal graining



Scratches, cracks and pits on diamond’s surface are called blemishes on diamonds. These defects are both negligible and noteworthy as few of the blemishes are almost no harm to diamond shape and structure whereas other blemishes can cause major deterioration in diamond’s surface quality.  Given below are few types of blemishes:


  • Polish lines
  • Grain boundaries
  • Naturals
  • Scratches
  • Nicks
  • Pits
  • Chips
  • Breaks

Now the question arises that after knowing about all these flaws and defects, how can one decide and grade diamonds with defects accordingly. Keeping these inclusions and blemishes in mind diamonds need to be classified. GIA has categorized these diamonds according to their number of inclusions, position on stones, composition and size.


FL Flawless: No inclusions or blemishes are visible to a skilled grader using 10 x magnifications. Extremely rare, less than 1 in 5000 jewelry quality diamonds are rated FL.
IF Internally Flawless: No inclusions, only blemishes are visible to a skilled grader using 10 x magnifications. FL and IF diamonds appear identical unless viewed under 10x magnification by a skilled grader. Less than 3% of jewelry quality diamonds are rated IF.
Very, Very Slightly Included: Inclusions are difficult for a skilled grader to see fewer than 10 x magnifications. VVS1 inclusions are typically only visible from the pavilion, while VVS2 inclusions are visible from the crown. In each, the inclusions are invisible to the eye, appearing identical to the higher grades unless viewed fewer than 10 x magnifications by a skilled grader.
Very Slightly Included: Inclusions are clearly visible under 10 x magnifications but can be characterized as minor. Inclusions are not visible to the naked eye. Perhaps 1 in 100 untrained observers can detect VS2 inclusions with the naked eye, on close inspection under ideal conditions.
Slightly Included: Inclusions are noticeable to a skilled grader using 10 x magnifications. SI1 is the lowest grade with flaws often invisible to the naked eye. SI2 inclusions are usually visible to the naked eye, although they will require close inspection.
Included: Inclusions are obvious under 10 x magnifications and may affect transparency and brilliance. I1 diamonds have inclusions that are almost always visible to the naked eye.

Because I2-I3 diamonds have pronounced inclusions, and in the case of I3 may even affect the diamond’s durability, they are not offered by Lumera.


While buying the diamond, buyer needs to keep the type, size and location of flaw in mind. Type of flaw or defects would include blemishes or inclusions and size of defects can be biggest larger or sometimes not even visible. Location of flaw can be anywhere on diamond.

Copyright © 2016 Auctions Pvt. Ltd