Before buying a diamond ring, it helps to know a few key things. Check the Four...

https://yenkee-wiki.win/index.php/What_Should_Be_on_a_Diamond_Grading_Report_Besides_the_Four_Cs%3F

Before buying a diamond ring, it helps to know a few key things. Check the Four Cs—cut, color, clarity, and carat—to understand the diamond's quality. Look for the GIA grading report number to verify authenticity