Celebrate the one you'll never stop loving with this lab-grown diamond double-heart necklace from the unstoppable love collection. 10k white gold the open outer heart is partially lined with round-cut lab-grown diamonds inside, an open heart in 10k yellow gold features a round lab-grown diamond that continuously sparkles from every angle, just like your love independently certified total lab-grown diamond weight is 1/2 carat 16- to 18-inch adjustable rope chain with spring ring clasp