Mathematical formula for trillium settings

Jewelry Discussion
1

Hi Orchid,

Is there a mathematical formula for computing what size tubing would
be the correct size to make a tube setting for a trillium stone.

Thanks, Vince LaRochelle

2 
Is there a mathematical formula for computing what size tubing
would be the correct size to make a tube setting for a trillium
stone.

Perimeter of a stone should equal to circumference of the tubing
which is approximately diameter times 3.

Mathematically it is 2 Pir - r - radius, Pi - 3.14

Leonid Surpin

3

I think you’ll find you need to add a bit over formula. Each corner
requires additional material to go around its radius, over and above
the calculated perimeter.