British sovereigns are among the most counterfeited gold coins in the world. Here are the specific checks that separate a genuine 7.98g sovereign from a dangerous fake.
Contents6 sections
The British sovereign has been continuously produced (with gaps) since 1817. Over 200 years of mintages plus a small physical size make it the most counterfeited gold coin in the world after the American Eagle. The good news: real sovereigns have very specific physical properties, and any deviation is a red flag.
Check 1: Weight and dimensions
A genuine full sovereign weighs exactly 7.98g (often quoted as 7.988g), has a diameter of 22.05mm, and a thickness of 1.52mm. A jeweler's scale accurate to 0.01g will catch most fakes immediately because tungsten-cored counterfeits cannot match all three dimensions while preserving correct weight.
- Weight: 7.98g (tolerance Β±0.02g)
- Diameter: 22.05mm
- Thickness: 1.52mm
- Composition: 22-karat (91.67% gold)
- Fine gold content: 7.32g
Check 2: The ping test
Tap a sovereign gently against another gold coin or balance it on a fingertip and tap with another piece of gold. A genuine 22-karat sovereign produces a distinctive high-pitched ring that sustains for 2-3 seconds. Tungsten cores deaden the sound; brass and copper cores produce a duller, shorter tone.
Check 3: Magnetic test (limited)
Gold is non-magnetic. Most counterfeit metals (steel, iron-based alloys) are. A neodymium magnet should slide cleanly off a genuine sovereign. This catches lazy fakes but not the better tungsten-core counterfeits, which use non-magnetic cores.
"The ping test alone catches more fakes than every other test combined. It is a 200-year-old technique that still works because counterfeiters cannot fake the metallurgy of resonance." - dealer, Hatton Garden
Check 4: Strike quality and mint marks
Genuine sovereigns from London, Sydney, Melbourne, Perth, and the modern Royal Mint show extremely sharp, deep strikes with crisp lettering. Counterfeits typically have soft, rounded letters, weak hair detail on the monarch's portrait, and indistinct St. George's spear or dragon scales. Specific mint marks (S, M, P, C, I) on the ground line below the dragon must match the year.
Check 5: Ultrasound or specific gravity
For high-value purchases, use a Sigma Metalytics or specific gravity test. The specific gravity of 22-karat gold is 17.7-17.8. Tungsten is 19.3, brass is 8.5. A simple water-displacement test catches almost any counterfeit core material.
What to avoid
Be especially wary of "lot" purchases of pre-1900 sovereigns at deep discounts. Counterfeit operations in Lebanon and Italy in the 1960s-70s produced convincing Victorian sovereigns at scale, and many are still in circulation. Buy from established dealers with return policies, not online auctions.
Bottom line: Five minutes with a scale, a caliper, and a magnet catches almost every counterfeit sovereign. Add an electronic tester for purchases above a few thousand dollars and your authentication failure rate drops to essentially zero.
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