Fabricating a twisted pendant using sinusoidal stakes employing anticlastic forming technique

I cut out the pattern out of 14k yellow gold and filed its edges.

   I bent the metal strip into a circle over a round mandrel.

Using sinusoidal metal stakes and plastic hammers I hammered the metal adding curvature to the shape. In the last photo you can see a sinusoidal metal stake (source: www.riogrande.com).

Using my hands I twisted the ends of the circle into opposing directions, as a result it opened into the shape seen in the photo. 

The polished pendant hanging from a gold chain.

The polished pendant hanging from a pink tourmaline necklace.