The Ultimate Diamond Cut Grade
Diamonds that
sell themselves.
8X® gives your customers a diamond they can see is different, and a grade that proves it.
Join the 
Club
<1%
of Excellent-cut rounds qualify as 8X®
8 tests
measured on every stone,
not one adjective
Guaranteed
GCAL stands behind every
grade it issues
ISO 17025
ANAB-accredited forensic laboratory
The problem
Same grades.
Same story.
The lowest price wins.
Top grades used to be rare. Today, almost every stone in a typical case reads the same on paper, so customers shop on price. 8X® gives them a reason to choose yours, and pay a premium.
“Without differentiation, products compete only on price.”
Why retailers stock 8X®
What 8X® brings to your store
Distinction in your showcase.
Stand apart with a top-tier offering for customers who want more.
Beauty that speaks for your store.
The diamond they show their friends. The jeweler they recommend.
Confidence in every diamond.
Get the quality you expect. Deliver the excellence they're looking for.
Hear it from jewelers
Don't take our
word for it.
“I can say with confidence I've never presented a GCAL 8X stone where a customer has chosen not to buy an 8X stone.”
How I Help Customers Choose a Beautiful Diamond
Paul Cassarino
The Gem Lab, NY
They See the Difference Before They Know the Difference
Dan Moran
Concierge Diamonds, CA
How Beautiful Diamonds Bring Me Customers
Randy Cole
Diamond Vault of Troy, MI
Why My Customers Choose GCAL
Ricardo Torre
Ricktop Diamonds, MX
Stock 8X® now
Do you have 8X® in stock?
These curated suppliers carry certified 8X® diamonds.
Pick one and reach out directly.
Not sure where to start? Ask GCAL
What 8X® means
Excellent is expected.
8X® is exceptional.
A stone earns 8X® only when it scores Excellent in all eight cut tests.
<1%
More than half of round brilliants earn an Excellent cut grade. Fewer than 1% of those qualify as 8X®.
Physical excellence
Polish · External symmetry · Proportions
Light performance
Optical brilliance · Fire · Scintillation
Optical excellence
Optical symmetry · Hearts & Arrows
Available in 8 shapes. Round, Oval, Pear, Princess, Marquise, Radiant and Cushion. Emerald coming soon.
The guarantee
A grade you can stand behind.
In writing.
GCAL guarantees its grades.
If a stone grades lower, the consumer can claim the difference back.
- Guaranteed gradingBacked by GCAL, not disclaimed
- Online verificationCustomers can check any certificate
- Laser inscriptionCertificate number on the stone
- Images of the actual stoneLight performance shown, not described
Free live webinar · [Date] · [Time] ET
How to sell beyond price with 8X®
- What the 8 measurements show, and how to explain them in a minute
- How retailers present 8X® at the counter
- How to start stocking 8X®
Hosted by
Angelo Palmieri
CEO, GCAL
Temporary image · 600×600Retailer kit
Everything you need to sell 8X®.
Free store locator
Let 8X® shoppers find your store.
Join GCAL's free locator, which sends consumers looking for 8X® Cut diamonds to retailers who carry them.
FAQ
Questions retailers ask
A cut grade that measures each diamond on eight aspects of cut quality: polish, external symmetry, proportions, optical brilliance, fire, scintillation, optical symmetry and Hearts & Arrows. A stone earns 8X® only with Excellent in all eight.
More than half of round brilliants earn an Excellent cut grade. Fewer than 1% of those qualify as 8X®. 8X® measures the individual stone, including how it performs in light.
Round, Oval, Pear, Princess, Marquise, Radiant and Cushion. Emerald is coming soon.
Contact any of the suppliers on this page. If you are not sure which one fits your store, leave your details and GCAL will point you in the right direction.
Yes. GCAL stands behind every grade. If a stone grades lower, the consumer can claim the difference back.
Yes. Every GCAL certificate can be verified online, and the certificate number is laser-inscribed on the stone.
The locator is free for retailers carrying 8X®. Fill in the contact form and mention the locator.
Contact us
Want to speak with a member of our team?
Leave your details and a GCAL 8X® specialist
will get back to you.