By swapping all its diamonds out with lab-grown diamonds, Maria Black refrains from cartel pricing, land displacement, unfair labour practices, violence and human rights violations.. 14kt Impact gold which is a mixed alloy consisting of 30% Fairtrade 14kt gold and 70% recycled 14kt gold.. Black-colored ceramics. Inner diameter: 10 mm. 12 Lab-grown diamonds: 0.07ct. White Rhodium plating. Post back closure. Nickel free