Not marks at all. Descriptions of colour, with no gold content implied.
Manufacturer's marks disclosing a plated finish, worldwide
These phrases appear in listings and on swing tags rather than being stamped into metal, and they are doing something quite specific: describing a colour while carefully making no claim about composition. 'Gold tone', 'gold coloured', 'gold finish' and 'golden' are all compatible with containing no gold whatsoever.
They are not deceptive in themselves — costume jewellery is a legitimate category and a great deal of it is well designed and collectable. The deception is contextual: a listing that says 'gold tone' in the specifications and '18K' in the title, or one that relies on a buyer skimming.
The practical rule is that a genuine metal claim is a number or a karat figure stamped on the object, and a description of colour is a description of colour. If the only reference to gold is in prose rather than in a stamp, treat the piece as costume.
These apply to this model and not to the rest of GP / HGE / GEP. Work them alongside the maker's general checks, not instead of them.
A metal claim lives on the metal. If the only mention of gold is in a description, a tag or a title and there is no fineness stamp anywhere on the piece, treat it as costume jewellery regardless of the wording.
Costume jewellery. The value is the design.
An orientation for honest, unrestored condition — never an appraisal, and never a quotation.
Lovenhall RingThe mark tells you what the metal claims to be. The instrument reads the setting and the stones together and gives a range to orient you — before anyone charges you for an appraisal.