The rarity of natural diamonds makes them highly sought-after, as it can take millions or even billions of years for these precious gems to form beneath the surface of the Earth. This limited supply results in natural diamonds being priced higher per carat, but the value of these gems is guaranteed to remain over time.

Lab-grown diamonds are often seen as a more affordable option due to their mass-manufactured nature and availability in unlimited quantities. However, the abundance of lab-grown diamonds in the market may not necessarily ensure that their value will hold over time. It's important to consider that the resale or upgrade value of a lab-grown diamond may not be as high as initially anticipated.