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Royal Mint · United Kingdom
Gold Britannia 1/10 oz
0.1 troy oz — 99.99% Goldgoldcurrent
Smallest fractional Britannia gold coin. Affordable pure gold investment with full legal tender status in the UK.
Physical Specifications
| Mass | 3.11 g |
| Troy Ounces | 0.1 oz |
| Diameter | 16.5 mm |
| Thickness | 1.2 mm |
| Edge | milled |
| Purity | 99.99% Gold |
| Fineness | 0.9999 |
| Density | 19.3 g/cm³ |
| Face Value | 10 GBP |
| Series | Britannia |
| First Minted | 1987 |
| Ping Frequency | 5,009 Hz |
Authentication Reference
Use these values to verify an authentic Gold Britannia 1/10 oz. All tests can be performed with a digital scale, calipers, and the EON ping tester.
Weight
3.11grams
Use a 0.01g digital scale. Calibrate first with a known object (a €2 coin = 8.50g).
Dimensions
Diameter16.5mm
Thickness1.2mm
Use plastic calipers (not steel — avoid scratching). Or use the camera tool with a bank card as reference (ISO 7810: 85.60mm × 53.98mm).
Acoustic Ping
5,009Hz ±3%
Balance the coin on your fingertip and tap the edge with a pencil or plastic pen. Use the Ping Tester to analyse the ring.