Seven grams. According to official website information of Cartier Company, as one of the classic jewelry under Cartier brand, the counter version of Cartier Necklace is one of the most popular jewelry in Cartier history. The product weighs 7 grams and is finely polished by hand. Cartier is a French luxury brand, mainly engaged in the manufacture of watches and jewelry, including: jewelry, watches, leather goods, perfume and so on.