Cut quality matters more than anything else. I have held 50+ diamonds and this is what I learned.

I spent four months visiting jewelers and handling diamonds before proposing last year. The single most important thing I learned:

Cut is everything.

I held two diamonds side by side:

• Diamond A: 1.20ct, F color, VVS2 clarity, GIA Very Good cut — $7,200
• Diamond B: 1.05ct, H color, SI1 clarity, GIA Excellent cut — $5,800

Diamond B was blindingly beautiful. Diamond A looked dull in comparison. Anyone looking at both stones for 10 seconds would pick Diamond B.

The difference: light performance. An Excellent cut diamond is engineered to return maximum light back to the viewer's eye. A Very Good cut loses more light through the bottom.

The hierarchy of what matters:

1. Cut — non-negotiable, always Excellent
2. Cut — still the most important
3. Cut — I cannot stress this enough
4. Then color (G or H is fine for white metal)
5. Then clarity (VS2 or even SI1 eye-clean is fine)
6. Then carat — buy as large as your budget allows AFTER getting cut right

Tools I used:

• GIA Report Check to verify every certificate
• Blue Nile's advanced search filters
• James Allen's 360° video on every stone

Spend 20 minutes with the GIA cut grade explainer. It will save you thousands and get you a better ring.