One Piece Card Grading in the UK.
From Manga Rares like the OP05 Gear 5 Luffy to Tournament Promos from the Treasure Cup, grading with Imperium ensures your treasured cards are authenticated and preserved in our UV-protected slabs.
Protect your One Piece cards
From raw card to display piece.
Know why.
Subgrades, defect call-outs, centering measurements, and a clear rationale with every graded card.
Artwork in it's own right.
Hand-crafted One Piece art made by real designers, not AI
All our One Piece art labels are hand drawn by our group of talented designers to perfectly match the design of your cards. No AI used here!
View our art labels
Serious standards. Unmistakably Imperium.
Every part of our process is designed to give you total clarity on your grades, absolute trust in our service, and a slab built to show off your cards.
Rare on purpose.
Our Red Label requires perfect 10s across every subgrade with a strict 51/49 centering standard.
Every cert has a story.
Scan the QR code on your slab or enter your certification number in our database to unlock a complete breakdown of your card's grade. Inspect high-resolution defect call-outs, precise centering measurements, subgrade rationale, and instant authenticity verification.
How much does it cost to grade a card with Imperium?
We have designed our grading tiers to offer a balance of speed and value, ensuring that whether you are securing a high-value grail or protecting a personal favourite, there is a service level built for your needs.
Send raw cards for professional grading, authentication, and encapsulation in an Imperium slab, complete with a detailed grading report.
Includes:
- 1–2 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 3–5 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 10–15 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 15–30 business days turnaround time
- 1 card minimum order
- Free detailed report
Already graded elsewhere? We safely remove your card from its existing holder, re-grade it to Imperium standards, and encapsulate it in our slab.
Includes:
- 1–2 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 3–5 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 10–15 business days turnaround time
- 1 card minimum order
- Free detailed report
Includes:
- 15–30 business days turnaround time
- 1 card minimum order
- Free detailed report
For cards we have already graded — replace a damaged holder, refresh the presentation, or update the label while keeping your existing Imperium grade.
Includes:
- 1–2 business days turnaround time
- 1 card minimum order
Includes:
- 3–5 business days turnaround time
- 1 card minimum order
Includes:
- 10–15 business days turnaround time
- 1 card minimum order
Includes:
- 15–30 business days turnaround time
- 1 card minimum order
Confirm your card is genuine without a full numeric grade — ideal when you need confidence in authenticity and professional presentation.
Includes:
- 1–2 business days turnaround time
- 1 card minimum order
Includes:
- 3–5 business days turnaround time
- 1 card minimum order
Includes:
- 10–15 business days turnaround time
- 1 card minimum order
Includes:
- 15–30 business days turnaround time
- 1 card minimum order
Submit a custom (non-tcg) card, add your own label details and we will encapsulate them with your custom text, upload your own artwork for the labels to really make them stand out!
Includes:
- 1–2 business days turnaround time
- 1 card minimum order
- Custom label text
Includes:
- 3–5 business days turnaround time
- 1 card minimum order
- Custom label text
Includes:
- 10–15 business days turnaround time
- 1 card minimum order
- Custom label text
Includes:
- 15–30 business days turnaround time
- 1 card minimum order
- Custom label text
Stackable, Hyper-Clear, UK-Made Grading Slabs
Designed, engineered and produced in the UK for unparalleled optical clarity and premium display, our slabs are built to protect your One Piece cards for a lifetime.
- Visual Quality: Showcases card colours vividly, with a non-hazing finish. We use only display-grade materials—no lightweight or foggy plastics.
- Durability & UV Protection: Features enhanced resistance against scratches, scuffs, and UV.
- Functionality: Purpose-built to stack securely, without causing scratches, for easy collection management.
- Security: Includes robust anti-tamper features for ultimate peace of mind.
The Imperium Grading Journey
Total transparency from intake to dispatch. Follow your cards through our rigorous multi-stage process with real-time alerts.
Arrival & Intake
Your package is opened and verified. We take intake photos and check cards against your order. You'll receive an email notification the moment we begin. Note: Unpaid cards are returned ungraded.
Stage 1 Grading
Initial assessment is completed by our first specialist grader. They input all data and scores into our secure system. We'll notify you by email as soon as the grading starts.
Stage 2 Grading
A second, independent assessment is conducted. To ensure a non-biased, consistent result, the second grader has no knowledge of the previous scores recorded.
Finalisation
Our Head Grader reviews both reports for accuracy and confirms the final grade. You will receive an email once your order successfully passes through this final evaluation.
Label Production
Your chosen label (Standard, Retro, Set, or Art) is printed, quality checked, and prepared for the final encapsulation phase.
Encapsulation
The card is ultrasonically sealed in our premium, UK-manufactured slab—engineered for clarity and protection.
Final Quality Check
A final inspection of the finished slab ensures it meets the "Imperium Standard" before it leaves our facility.
Dispatch
Slabs are securely boxed and postage labels created. You'll receive a final email with tracking information and an expected delivery date.
FAQs
How do I submit my cards?
Once submissions open, you can create your account and immediately begin the process. To submit your cards, simply select them from our database, finalise your label options and shipping preference, and then securely package and send your order to us. We handle everything from there. (Look for detailed packaging guidelines coming soon.)
Why should I get my card graded?
Grading is the ideal way to permanently encapsulate your favourite cards, protecting them from physical damage, environmental wear, and deterioration. The secure, tamper-proof holder ensures your card remains in its current condition for years to come.
Grading with Imperium also provides an unbiased, standardised, and recognised rating of your card’s condition. This eliminates doubt regarding a card’s authenticity and precisely measures its quality.
How long does it take?
The turnaround time for your submission is determined by the grading tier you select. Our service options provide a range of processing times, from as quickly as 2 days up to a maximum of 15 days from the day we receive your cards.
How much does it cost?
Depending on the tier option you have selected will change the cost of your submission.
What TCG can I grade with Imperium?
Currently we will grade Pokemon TCG, One Piece, and Lorcana. But watch this space, we will be adding more of your favourites in the coming months.
How do I become an affiliate of Imperium Grading?
For affiliate information and sign up form please follow the link here.
What do I do if I have a problem with my order?
If you have any problems with your order please contact us on our help email [email protected] or fill out the form on our contact page.
Do you grade custom or proxy cards?
We do not grade custom or proxy cards, only cards from an official TCG will be graded at this time.
Do you grade miscuts, errors or factory defect cards?
We offer miscuts, errors and defect card grading as part of our service.