Jewelry Tools & Calculators
Free, practical tools for fine jewelry and precious metals — value your gold and silver, price a diamond, convert a ring size, estimate a gemstone's carats, and decode karat purity and fineness.
Gold Value Calculator
Estimate the intrinsic melt value of any gold item from its weight, karat, and the live spot price — in grams, troy ounces, pennyweight, or kilograms
Silver Value Calculator
Estimate the melt value of coins, flatware, or jewelry from their weight, fineness (999, 925 sterling, 900, or 800), and the current silver spot price
Diamond Price Calculator
Estimate a diamond's price from its carat weight and price per carat — pick a 4Cs quality-tier preset or paste your own dealer figure for a precise result
Ring Size Converter
Turn a finger measurement in millimetres into US, UK/AU, and EU (ISO) ring sizes — enter the inner diameter or circumference and see every scale at once
Gemstone Weight Calculator
Estimate the carat weight of a mounted or loose stone from its length, width, and depth, its specific gravity, and its cut — no need to unmount or weigh it
Gold Karat & Purity Calculator
Convert gold karat to purity percentage and millesimal fineness, or reverse a purity percentage back to karat — instant, exact answers from 10k to 24k