I bought my partner's diamond and wedding ring set before we were hip to the shenanigans around diamonds. We had the ring melted down to make a pendant for our child with the diamond (which they'll receive when they're an adult) and no longer wear wedding rings (mine was a ~$20 tungsten ring from Amazon luckily). Thousands of dollars wasted in hindsight.

Hot take: Diamonds are scams, don't buy them! Take a trip, buy a house, start an investment account instead.