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The antique is a glass. its made out of sterling silver. inside the cup (where a drink would go) is plated with 24 karat gold. So its considered an alloy of gold?

I always sold pure gold charms, pendants and rings. Never had a piece like this, and I really wanted to sell it.

Will the gold stores still take it? They can melt the gold and separate it out through chemical and physical properties right..