How can you tell how old jewelry is?

Answer 1

417 is 10k 585 is 14k 725? is 18k 925 on gold (usually gold plated silver but can be on gold itself) Means 925 of 1000 parts whatever the hallmark is to stand for. It is illegal to misrepresent but it still happens.

Answer 2

Real jewels and gold has to breathe. There will be holes to allow this. Real metal is also marked as such.