Cupid Jewellery - Diamond 4Cs

The First C - Cutting grade of diamonds 

Diamonds are renowned for their ability to transmit light and sparkle so intensely. Precise artistry and workmanship are required to fashion a stone so its deliver the magnificent return of light only possible in a diamond. 




The Highest cutting grade given by GIA is “Excellent” grading in three aspect : cut grade, symmetry and polish.  ( only apply to round brilliant cut diamonds)

A diamond’s cut is crucial to the stone’s final beauty and value. And of all the diamond 4Cs, it is the most complex and technically difficult to analyze. GIA calculates the proportions of those facets that influence the diamond’s face-up appearance. 

These proportions allow GIA to evaluate how successfully a diamond interacts with light to create desirable visual effects such as:
Brightness: Internal and external white light reflected from a diamond 
Fire: The scattering of white light into all the colors of the rainbow 
Scintillation: The amount of sparkle a diamond produces, and the pattern of light and dark areas caused by reflections within the diamond  


The Second C : Color grading of diamonds

The diamond color evaluation of most gem-quality diamonds is based on the absence of color. A chemically pure and structurally perfect diamond has no hue, like a drop of pure water, and consequently, a higher value.  

Many of these diamond color distinctions are so subtle that they are invisible to the untrained eye; however, these distinctions make a very big difference in diamond quality and price.

note: the colored diamond does not fall into the color grading system of D-Z color, whereas these colored diamond are extremely rare and valuable. (except brown and gray colored diamond are graded within D-Z color grading system)


The third C : Clarity grading of diamonds

Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. This process can result in a variety of internal characteristics called ‘inclusions’ and external characteristics called ‘blemishes.’ 

Evaluating diamond clarity involves determining the number, size, relief, nature, and position of these characteristics, as well as how these affect the overall appearance of the stone. While no diamond is perfectly pure, the closer it comes, the higher its value.



The Last C: Carat weight of diamonds

Diamond carat weight is the measurement of how much a diamond weights.

A carat is defined as 0.2 gram. Apparently, the weight of the diamond it reflect on the size as well. Each carat can be subdivided into 100 ‘points.’ This allows very precise measurements to the hundredth decimal place. 

A jeweler may describe the weight of a diamond below one carat by its ‘points’ . For instance, the jeweler may refer to a diamond that weighs 0.25 carats as a ‘twenty-five pointer.’ Diamond weights greater than one carat are expressed in carats and decimals. 


GIA Diamond grading report

For more than 50 years, fine jewelers everywhere have considered the GIA Diamond Grading Report the premier credential of a diamond’s authenticity and quality factors in 4Cs.

The micro-laser inscription of the diamond’s unique GIA Report number is included for each diamond
send for grading. Diamond report number inscriptions are very helpful when it comes to protecting yourself from fraud, especially when it comes to servicing of your diamond jewellery, you can check the inscription to make sure you have the same diamond.

GIA Diamond Grading Reports are not issued for diamond synthetics, diamond simulants, or those that have undergoneunstable treatments, such as fracture filling or coating. And while reports may be issued for diamonds that have been laser drilled or HPHT processed, reports will indicate that the diamond has been treated.

The certification also stated all the information for one particular diamond:  


Source: GIA