Ill go off on a different tangent here because I'm a coin guy sooooo.....
Gold Maples
Gold Krugerrands
and
(my personal favorite) pre-1933 US Gold coins .....$5 Gold Half Eagle Indian....oh yeah
A person can say....."I bought a $15,000 piece of jewelry, so when I sell it, it's going to be worth $15,000".....until you meet someone who understands gold purity and weight and they offer you $300 in scrap value because that's what you actually have in front of you. Jewelry carries ENORMOUS premiums (and low purity) over spot price, so for investment purposes.....just understand what you're actually buying.
Want to ask a question that will make a jeweler sweat? ....start looking at rings or necklaces, and then ask, "If I would sell this, what would you give me for it (scrap price)?.....see if they even answer the question.