Open knowledge
Tools for Jewelers
Free calculators for goldsmiths and jewelry makers. Calculate ring blanks, plan your project.
Why do I share this knowledge?
Jewelry craft should be accessible. Everyone who wants to make jewelry deserves honest information, without hidden calculations or premium pricing for 'trade secrets'. AEJaCA is a studio that believes knowledge opens more doors than it closes. These tools are free, ad-free, no sign-up required.
Available Tools
Alloy Composition
Exact composition, melting range and hardness for Au, Ag, Pt alloys
What is my gold worth
Metal value from the spot price and a realistic buy-back range, fineness 333 to 999
Ring Blank Calculator
Strip length and blank weight for any metal and size
Ring Size Converter
Convert EU / US / UK / JP, or enter your finger circumference/diameter.
Printable ring sizer
Print, cut and measure your finger in a minute. With a scale check.