Thinking of buying a diamond ring? It helps to know the Four Cs—cut, color,...

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

Thinking of buying a diamond ring? It helps to know the Four Cs—cut, color, clarity, and carat—to understand what you’re getting. Make sure the ring comes with a GIA grading report number for proof of quality