Gold 1/4 oz APMEX Round specifications and ping frequencies
The Gold 1/4 oz APMEX Round is a gold coin from (2010–Present), weighing 7.78 g with a diameter of 21.7 mm. Tapped gently on its edge, a genuine one rings at about 4.3 kHz, 9.7 kHz and 16.9 kHz: its first resonance frequencies, set by its metal, size and thickness. A counterfeit made of a different metal, or with a different weight or thickness, rings at different frequencies, which is what the ping test above checks.
| Ping test reference frequencies | 4278 Hz · 9727 Hz · 16949 Hz |
|---|---|
| Metal | Gold |
| Composition | 99.99% gold |
| Weight | 7.78 g |
| Fine metal content | 7.779 g |
| Diameter | 21.7 mm |
| Thickness | 1.3 mm |
| Issuer | APMEX |
| Years | 2010 - Present |
Compare with the ping frequencies of every supported coin.
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