Yes all dioloma students are permitted to appear for JEE Mians for NIT.
The candidate must have secured atleast 45% aggregated marks (40% for SC/ST categories) and is allowed for admission subject to cutoffs in second year of Engineering directly.

The cutoffs are generally on higher side as there are limited seats allotted for Diploma Holders into various Institution for Engineering.

However, JEE advanced is also necessary to get hrough most coveted IITs.

JEE Mains is only accepted by NITs, GFTIs, IIiTs.

Complete indepth details on overall Eligibility criteria with all paramters for different categories mentioned below.

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-eligibility-criteria%3famp

All the very best, shall you have doubts you can revert back.

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