This portable diamond tester gem selector tool is a handy gadget for jewelers and gem enthusiasts. Made from durable plastic, it is designed specifically for testing diamonds and identifying gemstones. With its convenient pen-like design, this testing kit is easy to use and perfect for on-the-go testing. Ideal for those looking to ensure the authenticity and quality of their gemstones, this tool is a must-have for anyone in the jewelry industry. Made in China, this product showcases the latest in gemstone testing technology.