The image shows a close-up of a necklace with a large, oval-shaped gemstone that appears to be a blue gem, possibly an aquamarine or a similar color. The gemstone is set in a delicate chain of small, round diamonds, which are likely white or light-colored. The background is a neutral, light-colored surface, possibly a table or a wall, which helps to highlight the jewelry. The overall design suggests a luxurious and elegant piece of jewelry, potentially for a special occasion or as a fashion accessory.