The carriage stops right in front of the gate, all the other carriges getting out of the way. The guards stood at full attention. Though Chengyuan school was indeed only loosely associated with Rikui kingdom but the school was built within their territory. Not to mention, they were the biggest trade nation on the continent. Even if they had cultivators, they wouldn't be able to do anything without money so no footsoldier of the School would dare to be rude, much less arrogant, to the royalty of said kingdom.
Rong Jian's robe: https://i.pinimg.com/236x/7e/ab/38/7eab3890619f5fb35d1dfb1b9f52db2f.jpg
Pendant something like this but with a circle of jade around it and red tassels hanging from it and yellow: https://ae01.alicdn.com/kf/HTB1PQapBOCYBuNkHFCcq6AHtVXaF.jpg
Sorry I don't have any pictures of reference for Tianyu.
BTW, Qinwangye= 1st-ranked Prince
Wangye=prince