Zakat on Gold You Don't Wear
Gold kept as an investment or inheritance is definitely zakatable, even if you never wear it.
If you have gold jewelry that you never wear, or gold bars and coins kept as savings, Zakat is due. This is agreed upon by all scholars.
Investment Gold
Definitely zakatable.
Gold purchased or held as an investment is zakatable without any difference of opinion. This includes gold bars, coins, or jewelry bought specifically to hold value.
warning
Do Not Forget Hidden Gold