- Build annulus for shank. (1.8mm thick annulus, 2.25 cylindrical extrusion)
- Round edges of annulus (0.5mm).
- Place specific gem (1 carat ~= 6mm diameter) a few millimeters above the finger. (0.5mm from inner circle)
- Create cross-sectional area for the [ring holding cone]. There ought
  to be a gap for light to get in.
  - The gap is at the bottom of the stone. The bottom (point/culet)
    will be fully exposed above a cylindrical hole through the seat.
  - The shape is six-sided. It has an oblique outer and inner slope
    joined by rectilinear lines. The inner slope starts where the
    stone begins sloping. It slides flush along the stone's sloping
    edge for a while, then plunges in a vertical line (creating a hole
    for the culet to receive light). The outer slope slides down at a
    110 degree angle (shallower than the stone). The two slopes are
    joined by an upper and lower radius. The six sides in order are:
    inner slope, vertical drop-off, bottom radius, outer slope, upper
    radius.
  - 2.5 mm tall hole (vertical dropoff). 1.25mm radius hole (bottom
    radius). 110 degree angle between bottom edge of seat and its
    rising slope (outer slope). 0.375mm radius at its top (upper
    radius), set so that there is 0.125mm clearance between the
    outermost position of the stone and the outermost edge of the top
    of the cross section.
- Remove the cross-sectional area from the shank.
- Place prongs for the loft at 45 degree angles.
- Stone should stick into the prong 30-50% diameter of the
  prong. Diameter of the prong at 1.25mm. Center of prong at outer rim
  of setting.
- Bottom setting should intersect the 45 degree line and be centered
  on the outermost edge. Bottom setting has diameter 1mm. (So the top
  to bottom blends from 1.25mm to 1.00mm)
- Angled spline should pierce the outermost points of both circles.
- 124 angle at bottom of spline. Length at bottom handle 4.80mm.
- Top spline handle 3.40mm.
- Extrude top of setting into loft prong. Extend top of setting to
  approximately the height of the stone's crown, e.g. ~1.9mm.
- Repeat the prong fourfold at 1/4 circular degree increments (90
  degrees).
- Fillet (round) the top edge of the conic setting. (0.20mm)
- Add final fillets. (0.10 mm) on the faces of the conic setting (so
  as to blend them into the prongs?).
- Remove the interior of the shank from the setting at the top, for
  smootohness.