Jewelry Tools & Calculators
Free, practical tools for every jewelry lover — convert ring sizes, decode gold and metal purity, compare gemstones and diamonds, and look up birthstones, all in one place.
Ring Size Converter
Convert a ring size across US/Canada, UK/Australia, EU/ISO, and Japan — plus inside diameter and circumference in millimetres — from a real embedded jewellers' chart
Gemstone Carat Calculator
Estimate a gemstone's carat weight from its length, width, and depth, its cut shape, and its gem type, using each stone's real specific gravity — plus a quick round-brilliant estimate
Gold Value Calculator
Estimate the melt value of gold jewellery from its weight, karat, and today's spot price — in grams, pennyweight, or troy ounces — with the pure-gold content shown
Necklace Length Guide
Turn a chain length in inches or centimetres into its standard category — collar, choker, princess, matinee, opera, or rope — and see roughly where it sits
Birthstone Finder
Find the birthstone for any month or zodiac sign — the traditional and modern gems, their colour, and their meaning — or reverse-look up the month a stone belongs to
Diamond 4Cs Guide
Understand Cut, Colour, Clarity, and Carat with the real GIA scales — build a combination to see it explained, or browse the full cut, colour (D–Z), and clarity (FL–I3) scales