I have the silicone bands that says *INSULIN DEPENDENT*TYPE 1 DIABETIC, around the outside.
Got them from Amazon, I paid £9.95 (free p&p) in 2020, 4 in the pack.
They seem to last pretty well! I've been wearing the same one for 2 years and it seems fine.
Obviously, these are just visual aids to highlight any medical condition and no medical details are kept on record for medical personnel to access.
It gives me some peace of mind, should I need assistance, it may help.
Just re-read and it looks like I'm selling these! I'm not; there are probably funkier colours to choose from, and the Grey one could easily be mistaken for a Grey band with nothing written on it!