14k white gold lab grown diamond .63 carat total weight pendant on an 18" box chain with a lobster clasp. Lab grown Chatham Diamond is one of the most coveted gemstones we grow. Made from a single element, carbon, diamond is also the hardest mineral on earth, earning its title of The Unconquerable from the Greek word Adamas. Admired for its brilliance and vibrant fire, diamond’s natural beauty is undeniable.