Features: The Ring Sizer delivers precise gemstones measurement with three interchangeable acrylic templates (round/oval/square), ensuring accurate jewelry sizing for both engagement rings and custom designs. Featuring lasers etched calibration marks on scratch resistant 20cm acrylic, this lightweight tool maintains measurement consistency across 30+ international ring sizes with ±1mm tolerance. Essential for gemologists verifying stone dimension, jewelry makers crafting bespoke pieces, and couples selecting perfectly sized wedding bands during consultations. Streamlines workshop production lines, bridal boutique fittings, and gemstones quality control processes through instantly visual comparisons of carats weights and setting proportions. Color coded measurement zones with millimeter/inch scales enable simultaneous evaluation of prong spacing, stone alignment, and metal band thickness for rings/earrings/pendants. Specifications: Component: Acrylic Size:Approx.20x0.3x4.8cm/7.87x0.11x1.89inch Style:Round/Square/Oval Weight:30g Package Includes: 1PC Acrylic Ring Sizer Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you will not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color about the item.