I use the factory stock numbers on my labels. These are of the form SNT 020 4 0709.
First there is a three-letter code. The S is for Stäben, or rods. Standard lampwork cane then has an N, and the third letter indicates whether it is opaque (O), transparent (T) or layered (Überfang, Ü).
The 020 portion is the colour number. The 4 is the shade. This number can be 0 for unrated, or 1-5 for light to dark. The last four numbers indicate the rod diameter. 0709 is 7-9mm.
I also have a date on my labels. This is the date the glass was shipped to me. If I have the factory batch date, I include that also.