Is an engagement ring a good financial investment over time?

No. An engagement ring is not a good financial investment over time, and I say that as someone who makes a living selling them.

I hear this question often enough to predict the follow-up: a client wants permission to spend more than planned because somebody told them diamonds hold value. They don't. The gap between retail and secondary market is brutal. A round brilliant that cost $14,200 new will often bring $4,500 to $6,000 within a year, and that's with a GIA report and a clean stone.

Last spring a client named Daniel walked in with a 1.48 carat round brilliant, GIA triple excellent, I color, VS1 clarity, in a 2.2mm 18k yellow gold solitaire. He had the receipt. $14,200 from a store on Madison Avenue. He wasn't selling because of a broken engagement. He just wanted to know what the ring was "really worth." I called two secondhand dealers and one auction house. The best firm cash offer came in at $4,800. The auction house said maybe $5,500 on a good day, minus 20 percent commission.

He stared at me for a second. Then he laughed, but not like it was funny.

The only part of a standard engagement ring with a real floor is the metal, and only at scrap weight. An 18k gold band with 4.5 grams of metal has about $240 in melt value. The center diamond's resale value is a fraction of its retail price because wholesale buyers can source stones near Rapaport, and retail markup rarely comes back.

Lab-grown diamonds make this starker. I set them regularly and I think they're real diamonds. But the price floor keeps collapsing, and the resale market is nearly nonexistent. I had a client two years ago pay $3,100 for a 2.01 carat lab-grown oval, E color, VS1, and when she tried to sell it after a divorce two online buyers offered her $180 and $320, so she ended up keeping it as a pendant.

There are exceptions, but they are not the rings most people are buying. A natural fancy pink diamond from the now-closed Argyle mine with provenance and a GIA report can trade like a collectible, and an old European cut with known provenance and exceptional crystal can hold its own among dealers who know what they're looking at. That is a narrow corner of the trade. It isn't the Saturday afternoon at a retail chain with a white diamond and a zero-percent financing offer.

Insurance doesn't change this. An appraisal for replacement cost tells you what it would cost to make the same ring new. It does not tell you what someone will write you a check for. Any client who has filed a jewelry claim learns that difference fast.

So no, don't buy an engagement ring because you think it will appreciate. Buy it because the person wearing it will look at it every day and think of you.

Daniel kept the ring. He proposed two months later. He hasn't asked me about resale since.