"worthful" is not really used much although it is in some online dictionaries. "worthy" is a broad word, and can mean deserving of something or worth something. but if you are talking about the price of something like jewelry, you could use "valuable" instead

I’ve been we heard anyone say “worthful”

I think jewelry is valuable 🧐

I agree with Noah’s answer. Jewelry is valuable. A brave warrior is worthy of a promotion.