3DImpEx JT
precision • workspace • access
3DImpEx JT System
Professional jewellery calculations and licensed tools.
One workspace for licensed access, current downloads, and personal account management.
JT system
Licensed workspace for exact jewellery calculations.

The system combines authentication, licenses, registration, profile avatars, managed downloads, and the new calculator suite: a dedicated Gold Karat Calculator plus separate fineness/casting calculators for silver, gold, platinum, and palladium.

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Impossible cross-metal conversions have been removed. Licensing and remote verification remain compatible with the existing Windows client, while the internal math now works with nanogram-capable precision.
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Nanogram-capable internal precision
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Separate calculators by metal family
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Modular licenses and admin approval
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Windows client and download compatibility
Formula

Core equivalent-weight formula

JT now calculates equivalent weight only inside a single metal family. That removes invalid scenarios such as gold → silver while preserving the correct pure-metal mass for the chosen family.

Gold Karat Silver Fineness Gold Fineness Platinum Fineness Palladium Fineness Research Matrix
target weight = source weight × source fineness ÷ target fineness
3DImpEx

Licensing without breakage

Legacy karat / casting access levels remain available as compatibility aliases, while the new module system can enable calculators by metal and feature.

Accounts

Profiles and modular access

Each user gets a profile, calculation history, and a clean set of enabled modules that can be managed without the old admin-screen clutter.

Delivery

Managed delivery and documentation

The administrator controls the current version link, download policy, and the license-check API, which now has a dedicated migration README.