Coin Pinger
Acoustic bullion authentication — free, private, on-device
Coin guides
Coin ping test guides
Official specifications and acoustic resonance references for gold and silver bullion coins — plus any 1 oz .999 silver round by diameter in the app.
High
Good
Provisional*
— how confident we are in each computed reference (based on how well-established the metal's constants are).
Silver
Franklin Half Dollar
Italy 500 Lire
Morgan Dollar
Peace Dollar
Silver African Wildlife 1 oz
Silver American Eagle 1 oz
Silver APMEX Round 1 oz
Silver Bounty 1 oz
Silver Britannia 1 oz
Silver Chinese Lunar 1 oz
Silver Kangaroo 1 oz
Silver Koala 1 oz
Silver Kookaburra 1 oz
Silver Krugerrand 1 oz
Silver Libertad 1 oz
Silver Lunar Series II 1 oz
Silver Maple Leaf 1 oz
Silver Panda 30 g
Silver Philharmonic 1 oz
Walking Liberty Half Dollar
Gold
Austrian 100 Corona
Gold American Eagle 1 oz
Gold APMEX Round 1/4 oz
Gold Azadi
Gold Britannia 1 oz
Gold Britannia 1 oz (1987–2012)
Gold Britannia 1 oz (2013–2025)
Gold Buffalo 1 oz
Gold Double Eagle $20
Gold Kangaroo 1 oz
Gold Kangaroo 1/2 oz
Gold Krugerrand 1 oz
Gold Libertad 1/2 oz
Gold Maple Leaf 1 oz
Gold Panda 30 g
Gold Philharmonic 1 oz
Gold Sovereign
* Certain your coin is genuine but it doesn't match? Record 10 pings and we'll debug it with you — we're actively building the product and improving these references.