Streamlines workshop production lines, bridal boutique fittings, and gemstones control processes through instantly visual comparisons of carats weights and setting proportions Featuring calibration marks on acrylic, this lightweight tool maintains measurement consistency across 30+ international rings sizes with ±1mm tolerance Essential for gemologists verifying stone dimension, jewelry makers crafting bespoke pieces, and couples selecting perfectly sized wedding bands during consultations Color coded measurement zones with millimeter / inch scales enable simultaneous evaluations of prong spacing, stone alignment, and metal band thickness for rings / earrings / pendants The rings Sizer delivers precise gemstones measurement with three interchangeable acrylic templates ( round / oval / square), ensuring accurate jewelry sizing for engagement rings