主要グレーディング会社をひと目で
PSAは市場取引量でリードし、特にスポーツとビンテージで強く、その10は最も厚く流動性の高い市場を持つことが多いです。BGS（Beckett）はモダンカードで人気が高く、サブグレードと人気のBlack Label 10で知られます。SGCはビンテージで強い地位を持ち、特徴的な黒の台紙が目印です。CGCはコミック由来で、コレクタブルカード、特にポケモンなどのTCGで急成長しました。TAGは最も新しく技術志向の参入者で、コンピュータービジョンによるグレーディングと詳細なデジタルレポートを提供します。
なぜグレーディング会社が価値に影響するのか
同じカードの同じ数値グレードでも、会社によって売れる金額が異なることがあります。市場が各ラベルの個体数・一貫性・需要を考慮するためです。だからこそ、価値は特定のグレーディング会社とグレードに紐づいて初めて意味を持ち、汎用的な「9」や「10」では意味をなしません。
Slablineはすべてを読み取る
SlablineはPSA・BGS・SGC・CGC・TAGのグレーディング済みカードを、それぞれの固有グレードで、実際の同等取引から評価します。カードのラベルをスキャンすれば（グレーディング会社と認証番号は自動で読み取られます）、あなたが持っているものを正確に反映した価値が得られ、さらにコレクション全体の0〜1000の保護スコアも得られます。
Labels, slabs, and presentation
The physical slab is part of what a buyer is paying for, and each grader looks distinct on a shelf. PSA holders are instantly recognizable and ubiquitous in the hobby. SGC frames the card against a black insert that many vintage collectors prize for how it makes a card pop. Beckett slabs carry the subgrade breakdown and the well-known label colors, with Black Label reserved for the perfect cards. CGC brings the clean, professional presentation it built grading comics. TAG pairs its slab with a scannable digital report, leaning into its data-first identity.
Presentation is not just cosmetic. A consistent, trusted, tamper-evident holder supports authenticity at resale and signals to a buyer that the grade can be relied on — which is part of why the label feeds directly into value.
PSA — the volume and liquidity leader
PSA is the default for many collectors, and for a straightforward reason: scale. As the highest-volume grader across sports and vintage, it tends to have the largest pool of comparable sales, which makes its slabs easy to price and easy to sell. For blue-chip modern rookies and most mainstream sports cards, a PSA holder usually sits in the deepest, most liquid market — meaning you can convert it to cash quickly and predictably.
That liquidity is itself a form of value. When a buyer knows thousands of identical PSA-graded copies have changed hands, the price discovery is tight and the spread is narrow. For cards where you want maximum marketability and the broadest possible buyer base, PSA is frequently the safe, conventional choice.
BGS (Beckett) — subgrades and the Black Label
Beckett earned its reputation in the modern era, and its subgrades are the reason. By breaking a grade into centering, corners, edges, and surface, BGS gives buyers a more detailed picture of a card than a single number can — useful for high-end modern cards where condition nuance drives big price swings.
The Black Label sits at the top of that system: a card where every subgrade hits the top tier. Because it is genuinely hard to earn, a Black Label can carry a substantial premium over a comparable standard 10. For collectors chasing the absolute condition ceiling on a modern card, BGS offers a level of granularity and a top-end designation the other graders do not replicate.
SGC — the vintage specialist
SGC has carved out a strong, well-respected niche in vintage cards. Many vintage collectors specifically seek the SGC black insert, which frames older cardboard handsomely, and the grader is widely regarded for consistent, fair assessment of pre-modern material where surface and centering quirks are common.
For older cards, the choice of grader can matter as much as it does for moderns, and SGC is frequently the connoisseur preference in that lane. Its labels carry real weight with the vintage buyer base, which is exactly the audience that matters when those cards change hands.
CGC — TCG and comic heritage
CGC built its name grading comic books, and it brought that operational pedigree and clean presentation into trading cards. It has grown quickly in the card space, with particular traction in TCG — Pokemon above all — where its slabs are increasingly common and increasingly liquid.
For collectors focused on trading-card games rather than sports, CGC is a serious option whose market presence in that category has expanded fast. Its heritage in authentication translates into a label many TCG buyers trust.
TAG — the technology-forward newcomer
TAG represents the newest direction in grading: computer-vision assessment paired with detailed digital reports that aim to make the grade transparent and measurement-based rather than a matter of human judgment alone. The pitch is consistency and data — a buyer can see the underlying analysis instead of trusting a number on faith.
As the most recent entrant, TAG is still building its market footprint relative to the established graders, so its resale liquidity is earlier in its development. For collectors who value transparency and are comfortable being early to a newer standard, it is an intriguing choice — and one whose role in the hobby is still being written.
How grader choice affects resale value and liquidity
The same card in the same numeric grade can sell for different amounts across companies, because the market prices in each label population, consistency, and demand. A grader with a deep, active market for a given card type gives you tighter pricing and faster sales — that is liquidity, and it is real money when you need to sell. A thinner market can mean a wider spread between what a card is theoretically worth and what a buyer will actually pay this week.
This is why a value is only meaningful when it is tied to a specific grader and grade — never a generic 9 or 10. A PSA 10, a BGS Black Label, an SGC 10, and a TAG 10 of the same card are four different assets with four different markets. Treating them as interchangeable is how collections get mis-valued and under-insured.
How to decide which grader to use
Match the grader to the card and the goal. For mainstream sports and modern blue-chip cards where you want maximum liquidity and the broadest buyer pool, PSA is the conventional, safe pick. For high-end modern cards where condition nuance matters and you want to chase the absolute ceiling, BGS subgrades and the Black Label are hard to beat. For vintage, SGC commands real respect with the buyers who matter in that lane. For TCG and Pokemon, CGC has fast-growing traction. For transparency and a data-first read, TAG is the forward-looking option, with the caveat that its market is younger.
Two more practical inputs round out the decision: how a card already sells at each grader in its category, and what you intend to do with it. A card you plan to hold and insure has different priorities than one you plan to flip quickly. Look at where comparable sales are deepest for that specific card before you commit — the market will tell you which label it rewards.
Slabline values cards from every major grader
Whichever grader you choose, the slab still needs to be valued, tracked, and protected — and that is the same problem across all of them. Slabline values cards graded by PSA, BGS, SGC, CGC, and TAG, each at its specific grade, from real comparable sales. Scan the slab label and the grader and certification number are read automatically, returning a value that reflects exactly what you own rather than a generic price-guide figure.
From there, every slab — regardless of which company graded it — lives in one place, with a collection-wide 0-to-1000 protection score across insurance, concentration, storage, liquidity, and provenance, plus a broker-ready insurance schedule built from those live values. Slabline is not an insurer or a broker, and its values are estimates from recent comparable sales, not a certified appraisal. You can build your own score free for up to 25 cards and see every grader you own, side by side, in a single view.
