The best designer necklaces for women are high-quality, fashionable pieces created by renowned jewelry designers or luxury brands. These necklaces typically feature exquisite craftsmanship, unique designs, and premium materials such as gold, diamonds, and gemstones. Popular designers known for their standout necklaces include Tiffany & Co., Cartier, Bulgari, and Chopard, as well as boutique designers offering more personalized and exclusive options.