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France

Legal gold titles run 999, 916, 750, 585 and 375 — the floor is 375, not 18 carat. The 1994 law deliberately opened the market below 750, which is exactly the fact the "France requires 18K" claim gets backwards.

PropertyValueAuthority
Minimum fineness to sell as "gold"375 thousandths (9 carat). The loi du 4 janvier 1994 maintained the high-title tradition at 22 and 18 carats (916 and 750) AND opened the market to 585 and 375 (14 and 9 carats). A further legal title of 999 was created for each precious metal on 29 August 2001. [2]
Corrects a claim repeated across English-language sources that France requires 18 carat. The administering authority describes the 1994 law as opening the market below 750, not restricting it to 750.
Hallmarking compulsoryYes [2]
Administered by the customs administration rather than an independent assay office. From 20 November 2001 exemption thresholds from the guarantee hallmark begin at under 3 grams. Since 1994 a French-domiciled manufacturer may be authorised to apply the mark itself under a defined cahier des charges.
Vienna Convention (CCM) memberNo [1]
NOT a contracting state, despite compulsory domestic hallmarking. France operates its own national poinçon system outside the Convention, so a French hallmark does not carry the Common Control Mark. Germany is likewise absent.
  1. Convention on the Control and Marking of Articles of Precious Metals — Contracting States — Standing Committee of the Hallmarking Convention (Vienna Convention on Hallmarks, Contracting States list)
  2. Garantie des métaux précieux à travers l’Histoire — Direction générale des douanes et droits indirects — DGDDI (French customs administration) (DGDDI, Garantie des métaux précieux)