This molecular serotonin necklace is a thoughtful gift for workers passionate about chemical research, symbolizing a love for life and the pursuit of scientific dreams. Crafted from 925 sterling silver and opal, it is hypoallergenic, anti-tarnishing, and free from nickel, lead, and cadmium, making it ideal for long-term wear, especially for those with sensitive skin. Measuring 0.63 by 1.51 inches, this elegant piece is perfect for aunts, mothers, grandmothers, sisters, wives, or anyone who appreciates chemistry and scientific research. It makes a meaningful gift for birthdays, graduations, Christmas, or other special occasions. We appreciate your trust in our products. If you encounter any quality issues, please contact us—we are committed to providing the best solutions and ensuring your satisfaction.