Tools for Jewelry & Watches
5 toolsTools for jewelry and watch enthusiasts. Ring size calculator with AR try-on, watch case size guide, and watch battery replacement finder.
Ring Size Calculator
Pick a method below. Everything runs in your browser.
Watch Size Calculator
Wrist → ideal case diameter, lug-to-lug, strap width
Watch Battery Finder
Find the exact battery for your watch by model.
Watch Strap Gauge
Measure the lug width on your calibrated screen, or print a true-to-size gauge — then order the right replacement strap.
Stone weight in a jewelry piece
Estimate the weight of set stones from their measurements: carats, grams, net metal weight. Diamond, cubic zirconia, sapphire. Online, no install.
