I like to buy inexpensive "good" pieces, especially if they are something that can easily fall off and get lost like a gold pendant or earrings. Years ago I discovered a pair of gold and onyx earrings on sale for the same price as gold-plated earrings at an upscale department store. I bought them and after a couple of years, the button-style went out of style, and they've been in the jewelry box unworn for the last 15 or more years. Post earrings are starting to come back in style, so maybe I can be stylish in them again. So because jewelry follows trends, I prefer to buy costume jewelry that just looks expensive.
I have a few good pieces my husband has bought me, like my wedding set, a Ceylon sapphire and diamond birthstone ring, and recently he got me a blue diamond anniversary band, three diamonds with 1 ct. total weight, but I consider these rings special. I also have some Native American silver and turquoise pieces that I cherish.
Also, have you priced insurance on good jewelry? At first I insured my wedding set, but I discovered that at $1,000 per year, 10 years' insurance would replace the set. I've now put it away and don't wear it.