Halo engagement ring STL for 3d print and cast

Hi,

I need a STL cad file made up of an engagement halo ring. This will be printed and cast to make the ring.

It will be made in platinum, total final weight: approx 4.5 grams.

The centre stone will be a 0.737ct round yellow diamond. Diameter 5.7mm.

It will feature 12 surrounding 0.02 carats around the frame of the centre stone.

Each shoulder of the shank should have 9x0.02 carat diamonds on each side.

Size of ring should be ring size UK ‘S’.

Diamonds:
1 x 0.737ct centre diamonds (5.7mm)
30 x 0.02ct accessory diamonds (approx 1.75mm)

CAD should look like attached images.