What is 975 hallmark on gold?

Answer:
No such thing as 975 for gold.

Nearest matches for that number would be:

925 = Sterling silver
875 = 21ct/k gold (very rare, usually Arab countries do 21ct).

You could have misread it, hallmarks are very small so its an easy mistake to make.
First answer by Enzoheer. Last edit by Enzoheer. Contributor trust: 4 [recommend contributor recommended]. Question popularity: 0 [recommend question].