Understanding Gold Markings: What Does a 777 Stamp Mean?

Question
Can you tell me what a 777 stamped on a gold chain means? Thanks.

Answer
G'day Liz and many thanks for your query

Normally in Hallmarking, the numbers represent the decimal for the gold quality.

For example 375 or .375 is equal to 375 parts gold out of 1000 or 9ct. If this were a genuine hallmark then 750 or .750 would be 750 parts gold out of 1000 which is 18ct.

777 does NOT fit any standard gold hallmark (being just over 18ct if it were) so I would suspect it may be a makers mark or design or model number.

Hope this helps...