Lab-grown diamonds are at least 30-40% cheaper than mined diamonds of the exact same quality. Lightbox Jewelry exclusively sells lab-grown diamonds, and that's one of the reasons why they are cheaper than many other diamond sellers. However, they are not cheaper than many other lab-grown diamond sellers. In addition, Lightbox Jewelry does not provide independent third-party diamond inspection and certificates, so you can't be sure of the diamond quality. For that reason, it's hard to compare the quality and prices of Lightbox Jewelry diamonds. But there are certainly better places to buy lab-grown diamonds. Read why we think so in our Lightbox Jewelry review.