GIA Excellent Diamond Cut Filters That Work

By Josh Allen, Co-Founder of YourDiamondGuys.com. Fifth generation diamantaire with 30+ years in the global diamond trade. Former supplier to Tiffany & Co., Cartier, and Harry Winston.

Do not stop at the label, GIA Excellent diamond filters help you separate strong stones from average ones before the video and price get the final vote.

Most buyers think GIA Excellent means the diamond is already one of the best. That is wrong. GIA Excellent is a wide box, and plenty of stones inside that box are stones I would not recommend.

I always start with GIA for natural diamonds. Not because the cut grade alone is enough, but because GIA gives me proportions I can actually trust. Softer lab reports do not give me the same confidence in those numbers.

A search page can show hundreds of GIA Excellent stones. That sounds great until you start cutting the weak ones out. The real list gets smaller fast.

You do not need to memorize every angle. You need a simple way to know when a stone deserves a closer look and when it belongs back on the search page.

Why GIA Excellent Is Not Enough

For natural diamonds, GIA is the lab I trust. That does not mean every GIA Excellent diamond is a great performer.

The grade includes many proportion combinations. Some are strong. Some are average. Some are there because the category is broad.

The Filters I Use First

For round brilliants, my starting screen is table 56 to 58 percent, depth 60 to 62.4 percent, crown angle 34 to 35 degrees, pavilion angle 40.6 to 41 degrees, Excellent polish, Excellent symmetry, and none to faint fluorescence.

What I Check After The Filters

The filters reduce the list. They do not choose the winner.

After the numbers pass, I compare face up millimeter size, inspect the video, and look for leakage, obstruction, or a dead center.

If a stone is priced like a top performer, I want stronger proof. That can mean Ideal-Scope, ASET, Hearts and Arrows images, or a credible performance evidence.

What To Ignore

Do not let one calculator score make the decision for you. It can help screen. Your eyes still get a vote.

Do not buy the label. Make the stone prove it.

Reach out to Rob or me at YourDiamondGuys.com, or book your free consultation. We will look at the actual stone with you. No sales pitch.

Where Filters Shrink The List

Use these filters to make the search smaller and smarter. Then stop staring at the spreadsheet and look at the diamond. The video and the price still make the final call.

Mistakes I Would Skip

1. Do not assume every GIA Excellent stone is a top performer.
2. Do not use one calculator score as the final decision.
3. Do not skip video review after the numbers pass.
4. Do not pay for a cut label when the stone does not show the performance.

Two Hundred Stone Search Example

A buyer can find 200 GIA Excellent round diamonds in one search. That does not mean there are 200 good choices. After the filters, the list gets much smaller. Then the real work starts. I compare the video, the face up size, the inclusions, and the price. The filters get you to the table. They do not pick the stone.

Free GIA Report Analysis for Diamond Buyers

Questions I Ask After Excellent

1. What are the table, depth, crown angle, and pavilion angle?
2. Is the fluorescence None, Faint, Medium, or stronger?
3. Can I see the actual 360 degree video?
4. How does the face up size compare with similar stones?

Where I Would Compare Filtered Stones

Use these sites as comparison tools, not automatic recommendations. I would compare similar stones on Ritani and Blue Nile, then judge each diamond by the report, video, spread, and price. If the stone is weak, the link does not save it.

Questions? Reach out directly for a free consultation, or drop them in the Diamond Buyers Academy community — Rob and I answer personally.