If you have some programming knowledge it should look like this:
Now for the item its really simple, add "bold" ("true" or "false") and "color" (uint, Hex below #FFFFFF or Dec below 16777215) attributes to your Tier tag, exclude them and it does nothing. Example:
Code:
<Tier bold="false" color="0xff1493">:></Tier>
For the server, if you havent already add a try-catch in db/Descriptors.cs so your server wont fook up when you make your Tier non-numbers. Example: