Whether you're looking for a classic round diamond or something more distinctive, these retailers offer hundreds of lab-grown styles. Original price: $2,900Add extra sparkle to a classic setting with this round lab-grown diamond ring. The twisted band on this lab-grown diamond engagement ring comes in white or yellow gold or platinum. READ MORE: Deals Amazon sells lab-grown diamond jewelry — plus 9 more unexpected findsBlue NileBlue Nile offers a wide selection of lab-grown diamond rings, including customizable settings and classic designs. For a more understated option, consider this heart-shaped lab-grown diamond ring.