Before buying a diamond ring, it helps to know a few basics. Check the Four Cs...

https://hatton-garden-jewellers.co.uk/7-things-to-check-before-buying-a-diamond-ring

Before buying a diamond ring, it helps to know a few basics. Check the Four Cs to understand quality, make sure the GIA grading report number matches the diamond, and think about how carat weight compares to the actual size