Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin comparison
Gold Britannia 1 oz vs Gold Krugerrand 1 oz
Distinct rings: how these two gold coins differ on the scale, under the calipers, and — computed from first-principles physics — in the ring.
Official specifications, side by side
| Gold Britannia 1 oz | Gold Krugerrand 1 oz | |
|---|---|---|
| Weight | 31.104 g | 33.93 g |
| Diameter | 32.69 mm | 32.77 mm |
| Composition | .9999 fine gold (2013+) | .9167 gold (22k) |
| Mint | The Royal Mint | Rand Refinery / South African Mint |
Expected ring, mode by mode
| Mode | Gold Britannia 1 oz | Gold Krugerrand 1 oz |
|---|---|---|
| c0d2 | 3.28–3.94 kHz | 4.30–4.96 kHz |
| c0d3 | 7.61–9.03 kHz | 9.94–11.32 kHz |
| c0d4 | 13.27–15.73 kHz | 17.24–19.63 kHz |
Their fundamental bands do not overlap: a genuine Gold Britannia 1 oz rings 3.28–3.94 kHz while a genuine Gold Krugerrand 1 oz rings 4.30–4.96 kHz. The ping alone separates these two coins — before you even reach for a scale. Frequencies are computed from each coin's published mass, diameter, and metal via free circular-plate physics — see the methodology.
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