In England...THEMIS represents the legal profession and is the iconic image of the Old Bailey Law Courts...hence my thought that it would be ideal for TWO LAWYERS TOOLS.... 8)
It can be a simple line representation of the lady herself in outline or maybe just weighing scales of justice would be enough with TWO LAWYERS TOOLS around the top half of the circumference like this maybe:
...and your estabished company date below...(example shown)
I would think any foundry would make quantities for you from a design.