This ring has 29 1.8mm HPD Lux H&A melee that are F-G/VS and .68ctw.
There are .6mm rails on both sides that act as a built in spacer so that the diamond girdles will not rub against the trellis basket of my HPD Symphonie (2.79 F-VS1 CBI).
OMG, the PRECISION!!! How did they even?! I have to admit, when I saw the CAD in your other thread, I was skeptical the diamonds in the band wouldn't hit the basket! BEAUTIFUL and BRILLIANT!