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Authenticate Your Glass! 

Elevate your trading experience safely.


RefCheck Verification

Buy with trust. Sell with ease.

Send your glass to us for verification, and we'll authenticate and grade your piece and send it back an updated authentication card. Pricing correlates each service level with a maximum declared value which covers insured shipping both ways for the service level you choose.

Maximum Estimated Value
Authentication Price

Our Authentication Process

Grading Scale

Our team of experts created the first and most trusted glass grading system. With over 45+ combined years of collecting glass, we’ve consulted with thousands of the members of the glass community for a unique and trusted grading scale intended for reliability, consistency, and transparency.

Our grading scale is out of 5 points with the classifications below:

D5: DeadStock Mint

VD5: Virtual DeadStock Mint


5: Mint
4.75-4.99: Excellent
4.5-4.74: Very Good
4-4.49: Good
3.5-3.99: Fair
3-3.49: Near Poor
2.5-2.99: Poor

2-2.49: Near Very Poor

1-1.99: Very Poor
0-0.99: Unacceptable


Conditions and intensifiers that determine

the score of your glass.


  • A DeadStock Mint (D5) is glass that is authentic, has never seen water or been used, and is authenticated in hand.

  • Virtual DeadStock Mint (VD5) is glass that is authentic, has never seen water or been used, and is pre-authenticated by the artist or verified sellers to be new and authentic. Pre-authenticated glass from verified sellers on the marketplace will be fully authenticated by our team before receiving your item.

  • A mint (5) represents glass that is virtually perfect. There are no chip/crack, scratches/flee bites, label fades, or staining on the glass.

  • Anything between a 4.75-4.99 (excellent) is a near-perfect piece. It may contain a minuscule amount of damage to the glass. This can include minuscule scratches/flee bite, chip/crack, label fades, and staining.

  • A very good condition (4.5-4.74) represents an item that may have more than one minuscule damage to the glass or one slight condition to the glass, including a chip/crack, water stain, label condition, or bloom.

  • Good condition (4-4.49) represents glass with one major flaw or a couple of intermediate flaws and minuscule/slight flaws.

  • Fair condition (3.5-3.99) is glass that may have one major flaw and most likely an intermediate/slight flaws.

  • Near Poor condition (3-3.49) glass may have multiple major flaws and potentially other flaws that may range from minuscule to intermediate. Pieces in this category are borderline in poor condition.

  • Poor condition (2.5-2.99) glass has multiple major flaws allowing the piece to visually appear it has endured damage over its lifetime.

  • Near Very Poor condition (2-2.49) glass will have at least 3 to 4 major flaws. A piece in this condition may start losing a visual appeal to the eye.

  • Very poor condition (1-1.99) is glass that has at least 4 major flaws and another minuscule or intermediate flaw on the glass. The glass has gone through advanced stages of wear and tear it barely has an appeal to the eye.

An unacceptable condition (0-0.99) is in the worst condition possible failing to meet an acceptable standard. It will have at least 5 major flaws with at least another minuscule to an intermediate flaw. The glass has advanced defects that the glass has lost the eye appeal entirely.

We use qualifiers to signify a condition or characteristic of glass that meets all the criteria for a particular grade but fails the standard in one area.



  • Tool Marks (TM): A mark on the glass from the pinching of a tool used during the production of the glass.

  • Repaired (R): Glass that has been repaired and has lost its originality from its original production.

  • Marks (M): Any miscellaneous marks that may appear on glass.

  • Downstem stuck (DS): When a downstem is stuck in the joint.

  • Air bubble (AB): When the glass has a natural air bubble from production.

  • RefCheck Vintage (V): Signifies vintage glass that is 10+ years old.

  • Impurity (I): When there is an impurity in the boro appearing to be as a black spec.

  • Removed Label (RL): When a piece was originally made with a label, but the label was removed.

  • Missing Piece (MP): When something that was attached to the glass has been removed or detached from the piece such as a millie or opal.

Grading Scale (Authentication)

Our Security Seals
Security for trust

RefCheck uses a security seal to identify our authentication cards and glass as original. Each security seal contains a unique authentication number, and we place a seal on the glass and authentication card. The seal number on the authentication card and glass should be consistent to signify a pair. If the seal is removed, it won’t stick to another piece of glass or card to fight counterfeit authentication cards and glass.

Shippd and Verifed
RC Secure
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