Thank you to everyone for taking the time to respond.
I found that AmanChahal's solution worked best for my case; it seems I was on the right track, I just needed to remove the roughness map to achieve the mirror effect "correctly".
I'm using the X13 because it's the most compatible version for my Macbook Pro M1. I tried X16, but unfortunately, it doesn't work well with this generation of Apple Silicon, concerning the rendering.
Thanks Rich_Winsor for your solution, but X13 doesn't have the 3D solid Specification tab for the Polyline 3D. I did try it on X16, and it's a great solution; it possibly looks the best.
And thank you, scottharris. I tried to use the Material Generation but couldn't find the diamond shape in mirror material. Maybe I still need to learn how to use the Substance Player properly.
Thanks again to everyone.