The standard created by the Gemological Institute of America (GIA)
"Four Cs" are always mentioned in the conversations about diamonds. Not everyone is familiar with what exactly the four Cs are. The four Cs have gradually been developed to grade and categorise diamonds.
Thousands of years ago, Indians created a simple diamond grading method. Until the early 17th century, the western jewellers improved on the method and developed a more sophisticated system in grading the value of a diamond. The four Cs standard created by the GIA was recognised worldwide and adopted by the diamond industry.