Âme Trio 18K white gold pendant necklace features approximately 0.78ct. tw. princess, square emerald and trillion-cut lab-grown diamonds. Every piece of jewelry is unique, therefore weights and measurements may slightly vary. The length is adjustable from 16" - 18". The total weight is 1.6g.Lab-grown diamonds have the same chemical, physical and optical characteristics as mined diamonds, but are grown above-ground rather than under. Learn more about lab-grown diamonds here.