10 Euro

The 2021 Belgian 10 Euro gold coin was struck using 999.9 fine gold, a purity level that reflects the Royal Belgian Mint's commitment to quality amid rising material costs.

That makes it a rarity in the Euro family, where most coins are base metals designed for circulation, not investment. The obverse likely features King Philippe's portrait, a standard for Belgian issues, while the reverse might depict a national symbol—though exact designs vary, and I've seen my share of surprises in proofs.

Mintage figures for this coin remain unclear; records from the mint aren't always public, especially for recent commemoratives. What I can say is that these gold pieces often appeal to investors more than hobbyists, given their bullion value.

Demand spiked in 2021, possibly due to economic uncertainty, but that's just a guess based on trends.

Pro tip: Don't confuse it with the common 10 Euro cent; one's for spending, the other's for stashing.