Gold Britannia
Sizes and Weights
First released in 1987, Britannia coins come in four sizes: one ounce, as well as fractional weights of half-ounce, quarter-ounce, and tenth-ounce. Britannias are considered some of the most stunning bullion coins globally. Both proof and bullion editions have been issued annually since 1987, although proof coins are often only available in complete sets.
| Face Value | Diameter | Weight | Alloy | Gold Content | Gold Content | |
| mms | Grams | /1.000 | Grams | Troy Ounces | ||
| One Ounce (1987 – 2012) | £100 | 32.69 | 34.0500 | .917 | 31.1035 | 1.0000 |
| One Ounce (2013) | £100 | 38.61 | 31.2100 | .9999 | 31.104 | 1.0000 |
| One Ounce (2014 – to present) | £100 | 32.69 | 31.2100 | .9999 | 31.104 | 1.0000 |
| Half | £50 | 27.00 | 17.0250 | .917 | 15.552 | 0.5000 |
| Quarter | £25 | 22.00 | 8.5130 | .917 | 7.776 | 0.2500 |
| Tenth | £10 | 16.50 | 3.4120 | .917 | 3.110 | 0.1000 |