system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do they make white gold? Can it be melted down and reused like yellow gold?

I've been wearing a white gold chain for a few years without taking it off, it's a part of me. I got to thinking about the differences between yellow and white gold, and if per ounce they are worth the same.
gpt
Gold jewelry is (almost) always an alloy of gold and some other metals.  Gold is too soft to use in its pure form for jewelry (it will scratch or deform too easily).

White gold merely uses other metals in its alloy which give it a white color instead of yellow (often nickel but other metals may be used).

White gold is measured in karats which means a white gold ring of 14 karats has the same amount of gold in it as a yellow gold ring of 14 karats.  This will make them about equal in price all other things being equal.