The value of a Louis d'or rests on two layers: its melt value (the gold it contains, tracked by the public daily spot price) plus a numismatic premium for its type, date, mint and condition. A dealer's offer is really the spot price minus a buyback margin, so the honest question to ask is not "what price?" but "what percentage of spot do you pay?"
"Louis d'or" covers a family of French gold coins, and the exact piece changes the calculation. Strictly, it refers to coins struck under the monarchy (Louis XIII to Louis XVI), but in everyday trade the term is stretched to the whole lineage of French gold pieces: the Napoleon 20-franc "Marianne" or "Coq", the 40-franc, the 10-franc and later Republic issues. Most circulating French gold is 900 fineness (21.6 carats), so a standard 20-franc coin holds a well-defined, published quantity of fine gold. Before valuing anything, identify the coin precisely: denomination, effigy, date and mint mark. Two coins that look identical can carry very different premiums once the date and rarity are read.
Value is built from melt value plus a numismatic premium, and each part moves independently. The melt value is simply the fine-gold weight multiplied by the day's spot price, which is public and identical for every buyer on the planet. The premium sits on top and reflects scarcity: mintage year, mint, historical demand and how many survive. On top of that, condition is decisive, because a coin graded as barely worn can command a markedly higher premium than the same type left scratched, cleaned or bent. So the drivers are: fine-gold weight (fineness x mass), the daily spot price, the coin's type and date, and its physical state. None of these is a fixed euro figure, they combine differently every day.
Because the spot price is shared, but the buyback rate is not. Every buyer sees the same public spot price; what varies is the margin they keep, expressed as the percentage of spot they actually pay you. A dealer paying a higher rate simply takes a thinner margin. Since no law forces a buyer to publish that rate, opacity is where value quietly leaks. Ask each buyer for the percentage of spot they pay on your specific coin, and whether they price the numismatic premium separately or melt the coin as scrap. That single question turns a vague quote into a comparable number. You can compare gold buyers in your city to see who is transparent about their rate.
Selling gold to a professional in France follows strict, non-negotiable rules that protect you. Payment must be traceable: the buyer pays by bank transfer or cheque, never in cash. You must show valid photo ID, and the buyer is legally required to record the transaction in a police register. On tax, a sale of gold coins falls under either the flat tax on precious metals, applied to the sale price, or the capital-gains regime if you can prove the original purchase price and holding period, which can reduce or eliminate the charge over time. Keep any invoice or inheritance document: proof of provenance can genuinely change your tax position.
Usually yes. Beyond the melt value of its fine gold, most Louis d'or coins carry a numismatic premium reflecting their type, date, mint and condition. Common dates in worn condition sit close to melt value; scarcer dates in good condition trade well above it.
Identify the denomination and read its official fine-gold weight, then apply the fineness (French gold coins are typically 900). Multiply the fine-gold weight by the day's public spot price to get the melt value, the floor beneath any offer.
No. French law requires payment for gold sold to a professional to be traceable, meaning bank transfer or cheque. A buyer offering cash is not following the rules, which should be treated as a warning sign rather than a convenience.