Karat Kit

Karat Kit is a simple, all-in-one jewelry toolkit built for jewelers, goldsmiths, and anyone who works with precious metals and gemstones — no internet connection required.

Features

★ Purity Converter Instantly convert between karat, purity percentage, and fineness (per mille). Enter any one value and see the others update automatically. Includes a quick-reference table for common gold purities (24K, 22K, 21K, 18K, 14K, 10K, 9K).

★ Weight Calculator Convert between the units that matter in the jewelry trade: grams, kilograms, milligrams, carats, grains, pennyweight, troy ounces, ounces, and tola. Swap units instantly and see a full quick-reference table.

★ Ring Size Converter Convert ring sizes between US, UK, EU, diameter (mm), and circumference (mm). Enter a value in any system and get accurate estimates across all others, plus a full reference chart.

★ Gemstone Reference Browse a searchable library of popular gemstones with Mohs hardness, color, birthstone month, and common origin — handy for customer questions or quick lookups on the sales floor.

WHY KARAT KIT

- Works completely offline — no internet connection needed

- No account, no sign-up, no login

- No data collected, tracked, or shared

- No permissions required

- Fast, lightweight, and easy to use

Whether you're on the shop floor, at a trade show, or just need a quick conversion on the go, Karat Kit keeps the tools you use every day in one simple app.

Karat Kit is developed by Skrill & Co Jewelry LLC.