Selling natural diamond engagement ring NYC

Have a natural diamond 1.8ct GIA certified engagement ring to sell

I don’t want to pay to insure it anymore. I do want a similar oval diamond pendant, but lab grown because I don’t feel comfortable wearing the natural diamond given its price. Also divorced so don’t really want to keep it. But it sounds like there’s not much of a market for natural diamonds these days

Should I stop insuring it regardless? turn it into a pendant and accept the loss if anything happens since its value has diminished? Or what would be an acceptable resale value?

I’m going to guess ideally 4k resale and I can just get a lab grown pendant for ~1k and pocket something?

EDIT: thank you everyone for taking the time to reply! Pleasantly surprised that there is some interest. I’m just going to shop it around in diamond district