Updated in June 2026: We have reviewed this article and formulated the statements regarding graded coins, slabs, liquidity, resale and value development more cautiously.
In short:
Graded coins are examined and evaluated by specialized grading companies such as NGC or PCGS and sealed in a slab. This article explains why slabs can help with authenticity, preservation, protection, comparability, and international tradability—without automatically resulting in higher value appreciation.
Those who buy rare coins today no longer focus solely on the metal value or historical significance, but also on authenticity, condition, and verifiable documentation. Graded coins, sealed in characteristic hard plastic slabs, have revolutionized the market. But why do professionals often pay twice as much for a coin in a slab compared to a “raw” coin?
At Wasserthal RareCoin.Store, we explain why grading is far more than just a description of condition.
The democratization of the market through objectivity
Previously, buying an expensive coin was a matter of trust between buyer and dealer. Grading by independent companies like NGC or PCGS has changed this power dynamic.
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Eliminating subjectivity: What one retailer describes as “excellent,” another might only consider “very nice.” A numerical grade (e.g., MS65 or PF70) on the Sheldon scale is a globally standardized language.
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Fine-tuning the assessment: Especially with top-quality specimens, nuances can make a difference of thousands of euros. Grading makes these nuances visible to everyone.
The “slab” as a protective shield and safe
A graded coin is sealed in a so-called “slab” capsule . This offers advantages beyond protection against scratches:
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Tamper protection: Once sealed, the coin cannot be replaced with an inferior copy without destroying the casing.
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Archival quality: The capsules are made of chemically neutral plastics. They prevent the formation of unsightly patina or environmental damage that could diminish the value of a gold or silver coin over decades.
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Digital provenance: Each capsule has a unique certification number and a barcode. The coin’s history and population can be checked at any time in the online databases of NGC or PCGS.
The return booster: Why graded coins are more liquid
In the investment world, liquidity is everything. A graded coin can be sold much faster.
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Global trade: A buyer in Singapore purchases a PCGS-certified coin from a dealer in Germany sight unseen, trusting the label. The grading eliminates the need for physical inspection before purchase.
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Auction advantage: Statistics show that certified coins achieve higher bids in online auctions because the risk of a “bad purchase” is eliminated for the bidder.
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Special labels: Exclusive additions such as “First Strike” (submitted within the first 30 days after the start of minting) or signatures of famous engravers on the label create additional Unique Selling Points (USPs) for your collection.
Conclusion: The end of doubt
Graded coins are the answer to the professionalization of numismatics. They not only offer protection for the physical object, but also function as a certificate of authenticity and condition guarantee in one . For investors who value transparency and maximum resale potential, there is no way around NGC or PCGS .
Ready for the next level? Discover a hand-picked selection of top-grade coins at RareCoin that will put your collection on a professional foundation.
For more interesting blog posts on this topic please see here:
Is it better to invest in graded or ungraded/raw coins?
Quality factors for gold collector coins
About the author
Larissa Wasserthal is the co-founder of Wasserthal RareCoin.Store. Together with Dirk Wasserthal, she focuses on modern numismatic gold coins, graded collectibles, and international grading standards. Their focus is on authenticity, condition, slab verification, traceable provenance, and realistically assessable collector value.
