A list of grading services that can actually increase the monetary value achieved at auction.

What makes my collectible more valuable? - It is among the top questions we get asked.  The answer for comic books, trading cards, signatures, vintage vinyl records, and other categories is "GETTING THE ITEM GRADED!".

Then the next question is "Can't you grade it?" and the answer is yes, but having it done and backed by the leading grading companies in their field is the only way you are going to increase an achieved price up to ten times higher (or more) when you go to sell it.  

But to add value by grading, or authenticating, you have to use the right company, or it doesn't mean squat.  

We are going to recommend what we believe (and have based upon hammer price at auction) to be the top companies in their category.   
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PSA Grading & Authentication

Almost every collector in the world knows this logo - PSA which stands for Professional Sports Authenticator.  They are the largest and most trusted third-party grading and authentication company in the world.  Founded in 1991, PSA has processed over 30 million cards and collectibles with a cumulative declared value of over a billion dollars.
What started out with a focus on sports memorabilia, PSA has now expanded into almost every branch of the collectibles authentication and grading.  
We are not aware of any other company of this type that adds such significant ROI!
Visit PSA at https://www.psacard.com/

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CGC

Certified Guaranty Company, also known as CGC, is a Sarasota, Florida comic book grading service. CGC is an independent member of the Certified Collectibles Group of companies. It is the first independent and impartial third party grading service for comic books.  Founded in 2000, CGC grades comic books, trading cards, magazines, concert posters and lobby cards.  
Many auction houses rely on CGC and have presented their graded items including a Detective Comics #27 graded by Certified Guaranty Company® (CGC®) realized $1.74 million in a May 21 Goldin Auctions sale. The price is a record for the issue, which features the first appearance of Batman.
Visit CGC at https://www.cgccomics.com/

 

Goldmine Record Grading

Goldmine is the standard among astute vinyl collectors.  They currently do not grade the record, but they have developed a standard that serious collectors use.  They have clear cut precise standards that allow users to establish an approximate grade of vinyl records.
Visit Goldmine at https://www.goldminemag.com/collector-resources/record-grading-101