This is a one-of-a-kind necklace custom-made by a jewelry store that handles everything from design to sales in-house. It features a heart-cut blue sapphire as the main stone, with a deep, clear blue, and a small, sparkling aquamarine placed above it, making it a design for adults. The clasp is hallmarked K18, indicating that the necklace is made with care in both materials and craftsmanship. The main stone, the blue sapphire, was originally a heart-cut loose stone, and the jeweler explained that "a heart cut can only be achieved with a sapphire of good quality." Therefore, they were initially hesitant to sell it, but they loved the color and brilliance and, after some persuasion, were able to acquire the stone and have it made into a necklace. The blue color changes depending on the background and the way the light hits it. Please examine the photos carefully before considering a purchase. Enjoy the combination of the deep blue of the high-quality sapphire and the soft sparkle of the aquamarine. Materials and Specifications: Gemstones: Blue sapphire (heart cut), aquamarine Clasp: K18 (hallmarked) Accessories: Dedicated case *An appraisal certificate is not included. The gemstone names and materials are based on the explanation at the time of purchase and the hallmarks. Condition: There are no noticeable damages, and the overall condition is good. Please understand that this is a pre-owned item and has been stored at home before purchasing. Shipping: We will ship via anonymous delivery.