Coin Pinger
Acoustic bullion authentication — free, private, on-device
Silver coin guides
Silver coin ping testing
Silver is the ideal ping-test metal: high stiffness-to-density gives a loud, long, clean ring, and silver's elastic constants are the best-characterized of any coinage metal — so every reference below carries our highest model confidence. Modern 1 oz bullion coins cluster around 38–41 mm and ring their fundamental near 3.5–5 kHz; the classic 90% "junk" silver coins ring similarly but with wider bands to allow for circulation wear.
31 full-size silver coins — official specs & expected fundamental
| Coin | Weight | Diameter | Fineness | c0d2 ring | |
|---|---|---|---|---|---|
| Barber Dime (1892–1916) | 2.5 g | 17.91 mm | .900 silver | 7.39–9.23 kHz | |
| Barber Half Dollar (1892–1915) | 12.5 g | 30.6 mm | .900 silver | 4.33–5.42 kHz | |
| Barber Quarter (1892–1916) | 6.25 g | 24.26 mm | .900 silver | 5.49–6.85 kHz | |
| Franklin Half Dollar | 12.5 g | 30.6 mm | .900 silver | 4.33–5.42 kHz | |
| Italy 500 Lire | 11 g | 29.3 mm | .835 silver | 4.54–5.67 kHz | |
| Kennedy Half Dollar (1964) | 12.5 g | 30.6 mm | .900 silver | 4.33–5.42 kHz | |
| Mercury Dime (1916–1945) | 2.5 g | 17.91 mm | .900 silver | 7.39–9.23 kHz | |
| Morgan Dollar | 26.73 g | 38.1 mm | .900 silver | 3.86–4.82 kHz | |
| Peace Dollar | 26.73 g | 38.1 mm | .900 silver | 3.86–4.82 kHz | |
| Roosevelt Dime (1946–1964) | 2.5 g | 17.91 mm | .900 silver | 7.39–9.23 kHz | |
| Silver African Wildlife 1 oz | 31.103 g | 39 mm | .999 → .9999 | 4.13–4.70 kHz | |
| Silver American Eagle 1 oz | 31.103 g | 40.6 mm | .999 | 3.52–4.00 kHz | |
| Silver APMEX Round 1 oz | 31.103 g | 39 mm | .999 | 4.13–4.70 kHz | |
| Silver Bounty 1 oz | 31.103 g | 38.5 mm | .9999 | 4.34–4.95 kHz | |
| Silver Britannia 1 oz | 31.21 g | 38.61 mm | .999 | 4.31–4.91 kHz | |
| Silver Britannia 1 oz (1997–2012) | 32.45 g | 40 mm | .958 Britannia silver | 4.06–4.61 kHz | |
| Silver Chinese Lunar 1 oz | 31.103 g | 40 mm | .999 | 3.65–4.33 kHz | |
| Silver Chinese Lunar 30 g (2016+) | 30 g | 40 mm | .999 | 3.52–4.17 kHz | |
| Silver Kangaroo 1 oz | 31.103 g | 40.9 mm | .9999 | 3.34–3.96 kHz | |
| Silver Koala 1 oz | 31.103 g | 40.6 mm | .9999 | 3.44–4.08 kHz | |
| Silver Kookaburra 1 oz | 31.103 g | 40.6 mm | .9999 | 3.44–4.08 kHz | |
| Silver Krugerrand 1 oz | 31.107 g | 38.7 mm | .999 | 4.26–4.85 kHz | |
| Silver Libertad 1 oz | 31.103 g | 40 mm | .999 | 3.73–4.25 kHz | |
| Silver Lunar Series II 1 oz | 31.103 g | 45.6 mm | .999 | 2.16–2.56 kHz | |
| Silver Maple Leaf 1 oz | 31.103 g | 38 mm | .9999 | 4.58–5.21 kHz | |
| Silver Panda 1 oz (1989–2015) | 31.103 g | 40 mm | .999 | 3.73–4.25 kHz | |
| Silver Panda 30 g | 30 g | 40 mm | .999 | 3.60–4.09 kHz | |
| Silver Philharmonic 1 oz | 31.103 g | 37 mm | .999 | 5.10–5.80 kHz | |
| Standing Liberty Quarter (1916–1930) | 6.25 g | 24.26 mm | .900 silver | 5.49–6.85 kHz | |
| Walking Liberty Half Dollar | 12.5 g | 30.63 mm | .900 silver | 4.32–5.39 kHz | |
| Washington Quarter (1932–1964) | 6.25 g | 24.26 mm | .900 silver | 5.49–6.85 kHz |
2 fractional sizes (1/2 · 1/4 · 1/10 oz)
| Coin | Weight | Diameter | Fineness | c0d2 ring | |
|---|---|---|---|---|---|
| Silver Britannia 1/2 oz | 15.552 g | 27 mm | .999 | 8.98–10.23 kHz | |
| Silver Britannia 1/4 oz | 7.776 g | 22 mm | .999 | 10.19–11.60 kHz |
Fractional coins are smaller, so they ring higher and carry fewer readable modes — coins under 25 mm sit at the edge of reliable phone-mic testing; lean harder on the weight and diameter checks. See the fractional-size index.
Every frequency is computed from first-principles free-plate physics using the mint's published mass and diameter — see the methodology. Each coin's page lists all vibration modes, tolerances, and a physics explainer.
Coin not listed?
Compute the expected ring for any coin from its mass, diameter, and metal with the resonance calculator — or calibrate your own genuine coin directly in the app.