Iris thickness choice You could opt to have

You could opt to have a full non Euro shank if you prefer

This ring has a continuous inlay of Bocote

although the gears back there will mean the inscription would have to be small

so I left off those options

so 9 is IX (one before ten) or 944 is CMXLIV

Iris thickness choice You could opt to haveThe Iris ring has a working mechanical shutter mechanism which reveals a hidden stone. It could optionally hide a laser engraved letter. The tiny shutter vanes with special gear mechanisms were specifically engineered to fit on a ring and are laser cut from aerospace grade titanium. The ring is 9mm wide and the stone is 8mm diameter. It can be a lab created birthstone like this amethyst or can be a clear CZ. Just specify in the Comments section.