Reveal Your Coins’ True Beauty
The professional conservationists at NGC use a variety of proprietary techniques to remove harmful contaminants, stabilize and protect a coin’s surfaces and, in many cases, improve a coin’s eye appeal. Since, 2001, NGC has conserved more than 10,00,000 coins, tokens and medals.
A professional approach to numismatic conservation
From within a state-of-the-art secure facility, NGC’s conservationists use a variety of proprietary techniques to remove harmful surface contaminants, stabilize and protect a coin’s surfaces, and improve eye appeal. The American Numismatic Association (ANA), the only coin collecting organization chartered by US Congress, and the Professional Numismatists Guild (PNG) have named NGC their conservation service of choice. Read more >
Entrusted with the world’s most extraordinary coins
NGC has conserved and preserved many of the world’s most important numismatic rarities and collections, including pieces from the Smithsonian Institution. In addition to these rare and valuable vintage coins, NGC has handled coins recovered from four major shipwrecks along with countless modern coins.
What is numismatic conservation?
Collectible coins are susceptible to damage and changes of appearance as a result of improper storage and packaging, adverse environmental effects, mishandling, and natural changes over time. Surface contaminants such as PVC and other residues, soils, tarnish, spots and encrustation can diminish eye appeal and even permanently damage coins.
NGC pioneered a professional approach to numismatic conservation and can safely remove these harmful surface contaminants and often dramatically improve a coin’s eye appeal. Unlike improper cleaning, which will permanently impair a coin’s surfaces, professional conservation from NGC reveals a coin’s originality.
NGC will never perform repairs such as filling holes or smoothing scratches, or do any type of mechanical alteration. The techniques used by NGC are non-invasive and widely accepted by industry experts.
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Join todayWhat NGC Conservation can do
Prolonged exposure to an unstable environment can cause coins of all types to develop haze, spots, encrustation, verdigris, corrosion and tarnish. NGC specializes in the removal of these harmful surface contaminants and the stabilization of a coin’s surfaces. Read more >
Conservation for vintage and modern coins alike
All coin types can be affected by surface contaminants and negative environmental reactions. In many cases, coins have been stored or sold in soft plastic flips or mint packaging that contains polyvinyl chloride (PVC), a chemical now known to slowly leach onto the surfaces of a coin. If not safely removed, PVC and other residues will eventually result in permanent damage.
Some of these issues will make a coin ineligible for grading by NGC, if not first addressed by professional conservation. After conservation by NGC, coins will be sent directly for certification and, depending on the surface condition, will be numerically graded or NGC Details graded.
Important Note: Many coins are artificially toned or have had substances applied in attempt to hide other problems such as scratches or improper cleaning. These issues may become apparent after NGC removes the artificial toning or applied substances, but they are in no way caused by NGC’s conservation techniques. None of NGC’s techniques will cause scratches or an “Improperly Cleaned” notation at NGC.
PVC, glue and dip residues
Residue caused by PVC holders, glue or dip chemicals can often be safely removed by NGC Conservation. If left untreated, these residues can permanently damage a coin’s surfaces. Many modern Chinese coins have been sold in packaging that contains PVC.
Copper spots on gold coins
Unattractive reddish spots are often seen on gold coins. Gold is frequently alloyed with copper, and high concentrations of copper at the coin’s surface can result in reddish spots. NGC can carefully remove these spots to improve the coin’s eye appeal.
Haze
Many coins, particularly delicate proof coins, can develop haze on their surfaces over a period of time. This haze can be caused by improper storage or environmental conditions, or it can occur naturally over time as contaminants react to a coin’s surfaces.
Soils and encrustation
Many types of contaminants caused by storage and the environment can be removed by NGC, with the result being a dramatic improvement in the coin’s eye appeal.
Unattractive tarnish / toning
Virtually all metal types develop toning naturally over time. In some cases, toning can be quite attractive and desirable. In others, however, it can severely diminish eye appeal. In many cases, NGC can safely remove or minimize unattractive toning.
Artificial toning
A coin’s natural toning is sometimes artificially accelerated by chemicals or excessive heat. NGC can often remove this artificial toning to restore a coin’s originality — though removal may reveal previously hidden problems such as scratches or improper cleaning.
Applied substances
NGC can remove many substances applied to the surfaces of coins to change their appearance, such as putty or lacquer. As with artificial toning, removal may reveal other surface problems, and the coin may still receive an NGC Details grade after conservation.
What NGC Conservation cannot do
Though NGC Conservation benefits many coins, there are certain problems that cannot be remedied, such as corrosion, wear, scratches, and white “milk” spots. NGC does not make repairs and, likewise, cannot undo mechanical alternations. Read more >
Important Note: Hairline scratches and other surface issues caused by improper cleaning are often disguised with artificial toning or applied substances. Artificial toning and applied substances can be removed by NGC Conservation, which will then reveal the improper cleaning underneath. None of NGC’s techniques will cause an “Improperly Cleaned” notation at NGC.
White “milk” spots on modern silver coins
This form of corrosion is caused by the mint’s manufacturing process and can develop anytime, from right after striking to many years later. NGC cannot remove these unpredictable spots, but rest assured that none of NGC’s techniques cause them, either.
White “milk” spots can negatively impact a coin’s grade at NGC, but NGC cannot be liable for spots that occur after encapsulation. The NGC Guarantee specifically excludes coins “exhibiting environmental deterioration subsequent to certification. These issues include but are not limited to spotting, hazing, PVC and corrosion.”
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Improper cleaning
Many coins have been permanently altered by amateur cleaning, leaving fine scratches and other surface issues that cannot be fixed by NGC Conservation. Sometimes these alterations are only revealed upon removal of artificial toning or applied substances.
Mechanical repairs
NGC cannot undo or hide mechanical repairs such as tooling, plugged holes, rim repairs and re-engraved details. NGC also cannot remove solder from coins. In most cases these coins are eligible for NGC Details grading.
Damage, graffiti, wheel marks and countermarks
Damaged coins, including those that are bent, holed or have wheel marks, graffiti or countermarks, cannot be repaired by NGC. In addition, NGC cannot repair coins that are mounted or have been removed from mounts or jewelry.
Damage, graffiti, wheel marks and countermarks
Damaged coins, including those that are bent, holed or have wheel marks, graffiti or countermarks, cannot be repaired by NGC. In addition, NGC cannot repair coins that are mounted or have been removed from mounts or jewelry.
Damage, graffiti, wheel marks and countermarks
Damaged coins, including those that are bent, holed or have wheel marks, graffiti or countermarks, cannot be repaired by NGC. In addition, NGC cannot repair coins that are mounted or have been removed from mounts or jewelry.
Damage, graffiti, wheel marks and countermarks
Damaged coins, including those that are bent, holed or have wheel marks, graffiti or countermarks, cannot be repaired by NGC. In addition, NGC cannot repair coins that are mounted or have been removed from mounts or jewelry.
Scratches, abrasions and wear
The natural effects of circulation — scratches, abrasions and wear — cannot be undone. NGC does not re-engrave details, plug holes, or perform any type of repairs. Similarly, NGC does not repair or disguise planchet flaws.
Severe corrosion
Corrosion affects virtually all metals. A chemical reaction, corrosion causes the molecular makeup of a coin’s surfaces to change. Though NGC can stabilize a coin’s surfaces and prevent further damage, it cannot reverse corrosion that has already occurred.
Add “red” to copper coins
A copper coin's color can change naturally over time from red (noted as “RD” on the NGC certification label) to red brown (“RB”) to brown (“BN”). This is an irreversible process and NGC Conservation cannot change the BN, RB or RD designations assigned to copper coins.
The NGC Conservation Process
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NGC conservationists evaluate your coin
NGC first evaluates a coin to determine if it will benefit from conservation. If it will not benefit from conservation, the coin goes directly to grading.
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NGC conserves your coin
If NGC determines that a coin will benefit from conservation, it performs the necessary conservation techniques. After conservation is complete, the coin proceeds to grading.
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NGC Grades your coin
After conservation, coins are seamlessly transferred to authentication, grading and encapsulation. Once the coin has been graded and encapsulated, it is shipped back to the submitter.
Frequently asked questions
How much does NGC Conservation cost?
For current NGC services and fees for NGC Conservation, please click the link below.
Conservation Services & Fees.
Does NGC offer any type of guarantee?
NGC does not provide grade protection or any type of grade guarantee for coins submitted for NGC Conservation. Coins are guaranteed by NGC only after they are graded and encapsulated by NGC.
Important: Conservation services performed by NGC do not necessarily improve a coin’s grade. In rare instances, NGC Conservation may reveal additional issues that were previously hidden by residue or other surface contaminants. None of the techniques used by NGC will cause such issues. It is important to understand that coins conserved by NGC may still receive a lower grade or no grade from a coin grading service. By submitting a coin to NGC, the submitter waives any right to assert any form of legal claim against NGC (and any affiliates, divisions, subsidiaries or other entities related to NGC and its and their respective officers, directors, employees, agents and assigns) with respect to a lower grade or no grade subsequently being assigned to such coin by a coin grading company.
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What happens when NGC evaluates a coin?
NGC evaluates every coin submitted for conservation services to determine whether it believes the coin will benefit from conservation. Special handling, detailed below, applies to submissions of NGC and PCGS-certified coins..
- If NGC believes that a coin will benefit from conservation, the coin will be conserved and then goes directly to grading.
- If NGC believes that a coin will not benefit from conservation, the coin will not be conserved. In this case, raw (not holdered) coins will go directly to grading. Only the NGC grading fees will apply.
- If NGC believes that an NGC or PCGS-certified coin will not benefit from conservation, the coin will not be conserved and will be left in its original holder and returned to the submitter. The coin will not be transferred to NGC and the NGC grading fees will be refunded less a ₹350 processing fee.
- However, if NGC believes that a PCGS-certified coin will not benefit from conservation but will likely receive the same grade (or a higher grade) with NGC, the coin will not be conserved and will be transferred to NGC for CrossOver. Only the NGC grading fees will apply.
- *Please note that while NGC will attempt to accommodate special requests from submitters it can’t be responsible if any special requests are not fulfilled.
How can I submit to NGC Conservation?
You can submit to NGC Conservation in India through Marudhar Arts or Todywalla Auctions, Official Submission Centers in India.
The NGC grading process
To ensure impartiality, NGC specialists never know the identity of a submitter. All submissions are opened within view of each secure facility’s surveillance cameras, and every coin is assigned a unique tracking number and handled with the utmost care. A separate certification number is printed on the NGC label once the coin is encapsulated.
NGC employs the internationally recognized Sheldon grading scale of 1 to 70. Coins with surface conditions that preclude a numeric grade are assigned an NGC Details grade with the problem noted. Every coin is assessed by multiple members of NGC’s professional grading team to determine authenticity, grade and attribution.
After the coin is graded, it is encapsulated in NGC’s EdgeView® holder — the same holder that has been tested by the Smithsonian Institution and is currently used to house many of that museum’s most important rarities. Encapsulated coins are then inspected by a quality control specialist and imaged for NGC’s online certification verification tool.
Every NGC-certified coin is backed by the NGC guarantee of grade and authenticity, the strongest guarantee in the industry. NGC is the official grading service of the ANA and PNG.
What types of coins does NGC not grade?
NGC does not grade coins that are not genuine, coins that are of questionable authenticity or unverifiable authenticity, coins that have added or removed mintmarks, or coins that have altered dates. NGC will not grade coins that have altered surfaces, such as those with frost added to give a Cameo appearance. There are also some coin types that are ineligible for NGC certification, such as Chinese “cash” coins.
Does submitting to NGC Conservation mean that I will get a higher grade at NGC?
Submitting a coin to NGC for conservation does not mean that it will get a higher grade at NGC (i.e., be “upgraded”). NGC Conservation will improve a coin’s eye appeal and stabilize its surfaces. In some cases, coins may receive a higher grade at NGC after conservation, but this is not guaranteed.
Can NGC Conservation add “red” to copper coins?
A copper coin's color can change naturally over time from red (noted as “RD” on the NGC certification label) to red brown (“RB”) to brown (“BN”). This is an irreversible process and conservation cannot change the BN, RB or RD designations assigned to copper coins.
How do I contact NGC Conservation?
What if I submit a coin for both conservation and an NGC ReGrade, but NGC declines to conserve the coin?
NGC Conservation can help coins with unattractive toning, copper spots and other surface issues. Customers may submit a coin already certified by NGC for a service that includes conservation and an NGC ReGrade (Conservation+ReGrade). If NGC declines to conserve a particular coin under this combined service, then NGC will not perform the ReGrade. If the customer wants the NGC ReGrade regardless of the conservation determination, then the customer should write on their submission form: REGRADE REGARDLESS OF CONSERVATION DECISION.
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