Description: 【Quality Material】: This Diamond Color Scale Box is made from quality iron material, which is wear resistant and sturdy, allowing for long term repeated use. 【Great Craftsmanship】: This Stone Grading Tool features great craftsmanship. The stones are firmly fixed in the box with a glass cover and sponge inside Please do not open the lid. 【Careful Use】: If you need to open the lid of this Stone Color Tester Tool, please do at a small angle and gently tap the stone with tweezers to prevent it from falling. 【Wide Application】: This Jewelry Stone Tools set has a compact structure and lightweight design, making it portable and ideal for use as jewelry size reference tools, jewelry equipment, teaching tools, etc. 【Practical Tool】: This Diamond Color Grade tool is very suitable as a practical tool accessory for professionals or hobbyists who love jewelry or as a gift for family and friends who share this interest. Specification: Material: Iron Size Chart: 20cmx5cmx1.6cm/7.87inchx1.97inchx0.63inch Package Includes: 1Pcs Diamond Color Scale Stones Note: Please allow slightly errors 1-2cm differences due to manual measurement.