First, I love it. Sounds like 1998 Moment of Truth type of Gang Starr material. I think the J.Cole appearance was quite surprising because I felt they would’ve chosen an emcee that was a more classic 90s type emcee but they picked someone that was recognizable to younger hip-hop fans. That was a good choice. The beat is quintessential DJ Premier type boombap with a bright, prideful and triumphant piano loop with a beautiful violin line that comes in during the 3rd and 4th bars of the track.
I did feel like Guru’s voice during the verses sounded kinda higher volume wise compared to the chorus section but I got used to it. I loved Guru’s lyrics as they signify the importance of loving your family, the loyalty each member has towards another and used toughness of a diamond as a metaphor for strength & perseverance.
The cut “Family & Loyalty” is featured in my latest Boombap Blast podcast, episode 0025:

https://anchor.fm/boombap-blast-mixed-by-ka/episodes/Boombap-Blast-0025–Underground-Hip-Hop-Podcast-e5rl6v