The casing around the stones, as well the channel the diamonds float in, are reflectors.
All are very highly polished, while the photography can't capture it, the piece glows from the inside too.
I coat all the screwes with loctite so they can't vibrate out.
Your observations are all very accurate, there are relief cuts so the cutlet, and the pavilion facets don't get dinged.
It's assembled this way so I can go back and forth with fitting, it's critical all gaps are even and , even though the stone is beautifully cut. It's not square, only off by a few thousandths , but it's important that that aspect disseapears..