Jewelry Design Tools
Free, browser-based tools for jewelry designers and manufacturers — convert Rhino files, calculate alloy fineness, metal weight, and ring sizes. No account, no upload, nothing leaves your browser.
- Rhino 3DM Converter
Convert Rhino .3dm files to STL, OBJ, and other common 3D formats, right in your browser.
- Gold Alloy Calculator
Work out target casting batches, fineness adjustments, and mixed-batch fineness for gold and silver alloys.
- Metal Weight Calculator
Convert a known weight or volume across gold karats, silver, platinum, titanium, wax, and resin.
- Ring Size Calculator
Convert a ring size between US/Canada, UK/Ireland/Australia, France/Germany/Austria, Italy/Spain, and Russia/CIS.
Everything runs in your browser
Each tool below solves one specific, recurring problem in jewelry design and production — converting a file format, working out how much metal a casting will use, or matching a customer's ring size across sizing systems. None of them require an account, a file upload to our servers, or any data leaving your browser.
They're built and verified the same way as the rest of JewelModel: real reference data, cross-checked against independent sources, with the math shown rather than treated as a black box.
Frequently asked questions
Are these tools really free?
Yes. All of them are free to use, with no account, subscription, or usage limit.
Is my data uploaded anywhere?
No. Every calculation and conversion runs locally in your browser tab; nothing is sent to or stored by JewelModel.
Do I need to be a JewelModel vendor or buyer to use them?
No. They're open to anyone — jewelers, hobbyists, and 3D designers — whether or not you buy or sell on the marketplace.
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