Surface Verification
Specialized wand sensors measure resistivity just beneath the surface to help detect counterfeit materials or contaminants on the outside of your coin or bar.
Minnesota Precious Metal Verification
Secure your gold and silver with advanced, non-destructive verification.
PM Proof helps owners, collectors, investors, and dealers verify precious metal coins and bars with safe, accurate, data-driven testing.
100% Non-Destructive
Tests Through Cases
Coins & Bars
Proof Before You Buy, Sell, or Store
Verification built for modern bullion risk.
Counterfeit gold and silver items have become more sophisticated, including plated base metals, convincing fake assay cards, and inserts of high-density metals designed to imitate genuine bullion. A visual inspection is no longer enough. PM Proof gives you objective measurements so you can make confident decisions about your assets.
Our Comprehensive 4-Step Verification Process
Multiple measurements. One clear picture.
Our process tests both resistivity and density through up to four distinct measurements, helping identify plated, filled, or compositionally incorrect items without damaging them.
Deep “Thru Mode” Penetration
Onboard sensors send a signal through the sample from top to bottom to help detect foreign metals, such as tungsten or lead, hidden inside.
Precision Thickness Measurement
We electronically measure average thickness across the face of your item while accounting for relief, lettering, and design features.
Advanced Density Testing
By combining exact sample weight with precise dimensions, we perform a specific-gravity style density check against the expected alloy.
The Counterfeit Problem
Fake bullion is harder to spot than ever.
As precious metal prices rise, counterfeiters have more incentive to target investors with plated coins, filled bars, imitation rounds, fake packaging, and misleading certificates. Some counterfeits are designed to pass simple size and weight checks, which is why layered verification matters.
Before purchasing, selling, storing, gifting, or adding bullion to a portfolio, verification helps protect the true value of your holdings and reduces the risk of unknowingly accepting a fake.
- Visual inspection is limited. Modern fakes can look convincing.
- Weight alone is not enough. Dense substitutes can mimic real bullion.
- Packaging can be misleading. Sealed holders and assay cards can also be copied.
Why Choose PM Proof?
Confidence without compromise.
100% Non-Destructive
We will never cut, scratch, acid-test, or damage your valuable items during verification.
Tests Through Protective Cases
Our sensors can read through many plastic holders, cardboard flips, capsules, and protective assays, helping preserve condition and value.
Wide Range of Metals
We calibrate testing to the expected alloy, including pure gold, 22K gold, 90% coin silver, sterling, and .999 fine silver.
Local Minnesota Service
Professional precious metal verification for collectors, stackers, investors, estates, private sellers, and dealers across Minnesota.
Protect the True Value of Your Portfolio
Get your gold and silver verified.
Contact us for pricing, availability, and questions about your coins, bars, rounds, or sealed items.