Engagement Rings Fleur ring with lab-created simulant Nexus Diamonds; starting at $1,465; Diamond Nexus; 800-509-4990; diamondnexus.com 14k rose gold Fiorella lab-grown diamond ring; $990 (without center stone); Brilliant Earth; 801-691-0952; brilliantearth.com   Drop Earrings Leto emerald-cut drop earrings with 1.99 cts. t.w. lab-created simulant Nexus Diamonds; $442; Diamond Nexus; 800-509-4990; diamondnexus.com Cascade earrings in 18k white gold and white rhodium vermeil with 121 cts. t.w. lab-created diamonds; £2,990 ($3,880); Anabela Chan; sales@anabelachan.com; anabelachan.com Earrings with 17 cts. t.w. emerald-cut Diamond Foundry lab-created diamonds; price on request; Balmain x Diamond Foundry; anazaraly@balmain.fr; diamondfoundry.com   Stacking Rings Diama Bloom rings in 18k responsibly sourced rose, white, and yellow gold with 0.3 ct. t.w. Swarovski created