Deion Sanders' son, Shilo, will head into his first season at Colorado looking as fly as ever ... 'cause TMZ Sports has learned he just copped a sweet new chain -- that features 28 carats of diamonds!!
Primetime's kid -- who transferred from Jackson State to Boulder after his dad made the same move earlier this year -- got the bling from Saki Diamonds ... and the drip has an awesome story behind it.
Shilo considers himself a force on the field -- and when he makes tackles, he says it leaves his opponents with headaches.