Face value is not metal
One face value can hide coins with nothing in common. The 2007 Cannes Film Festival 10 euros is gold, 920 fine; the 2012 Hercules 10 euros is 500 fine silver; Sempé's 2014 10 euros are only 333 fine. Reading the number is never enough.
Three checks settle most cases: note the year and the design, weigh to a tenth of a gram, measure the diameter with calipers. Then compare with the table. The fineness is not always struck on the coin; the series tells you.
Finally, look at the finish. A proof has a mirror field and frosted relief and comes in a case with a certificate; a brilliant uncirculated coin looks more even and comes in a blister, on a card or in a cardboard folder.
The small gold coins
Monnaie de Paris gold euros are often tiny. The 2008-2010 Sower 100 euros weighs 3.1 g for 15 mm; the 2013 Peace 250 euros, first year of the Values of the Republic series, 3.89 g for 23 mm. Their size is not a sign of an imitation.
Others are heavier: the 2009 Sower 250 euros, 920 fine, weighs 8.45 g, and the 2010 500 euros reaches 12 g for 31 mm. In 2014, the only gold coin in the series drawn by Sempé is a 500 euros titled The Republic.
These coins often come in a capsule. Leave it closed: a fingerprint on polished gold leaves a lasting mark, and the coin can be read through the plastic.
The 41 g silver 50 euros
From 2014 to 2020 the Monnaie de Paris kept one format for its pictorial 50 euros: 900 fine silver, 41 g, 41 mm. It is used for Sempé's two Peace 50 euros (June and September 2014), for the 2015 Astérix and Peace 50 euros, where Dogmatix holds an olive branch, and for the 2020 Smurfs, issued in colour.
The 2010 Sower 50 euros shares the 41 mm diameter but weighs 36 g, so the scale tells them apart at once.
On the Smurfs, colour is part of the original issue. On any other series, a painted or gilded coin was almost always decorated later by a private company.
False leads
- Commemorative 2 euros, such as those from Monaco, the Vatican or San Marino: bimetallic circulation coins, valid across the euro area, with no precious metal.
- Medals and souvenir tokens: even when struck by the Monnaie de Paris, they carry no face value in euros.
- Coins coloured or gold-plated by a third party: the added decoration changes neither the metal nor the origin, and the packaging then does not bear the Monnaie de Paris name.
- Silver Sower or Hercules francs, which inspired the 2008-2013 series: a value in francs rules them out.
Keeping a proof coin perfect
These coins leave the mint without circulating; handling is what damages them.
- Fingers leave stains on a mirror field that never come off. Hold the coin by the edge, or better, leave it in its holder.
- A cloth scratches the polish with every wipe.
- 333 and 500 fine alloys, rich in copper, darken in open air.
- Large modules of 41 to 50 g show the slightest knock on the edge.
More in our guides on coin grades, why not to clean a coin and checks against fakes, which mostly target gold.