Diamond ring design issues

Beginner user to shapr3D. I am designing a ring setting. What is the best way to get tapered prongs that end in about 1mm and start in a more square shape around 1.5-2mm and make it look good but also follow the shape of the diamond nicely? I

I’m attaching an image below of my issue, I’ve tried using loft, but it doesn’t seem to work how I want it to, unless I am doing something wrong.

The diamond is shape is an emerald shape and the dimensions are accurate to my stone.