The Hallmark Society
Tools
Four things we built because we kept doing them by hand. Everything runs in your browser. No photographs are uploaded, no data leaves the page, no email address is asked for.
- ReferenceHallmark decoder Search 60 marks by figure, symbol or country. 585, 830S, EPNS, an anchor, a leopard's head, three towers.
- GuidedDate your piece Answer what you can see and it returns an era, the reasoning behind it and the periods the evidence rules out.
- VisualCut comparator Drag between two diamond cuts drawn to real proportions and watch a century of technology happen.
- ArithmeticGold calculator Fineness to pure metal to melt value, with a straight answer about what that number is worth in practice.