Two prong setting--is this secure?

[Opticcurve]

My fiancee is in love with this setting but I'm not sure if it is secure enough for the diamond. Any thoughts?

http://www.whitneyboin.com/pages/rsing/r2.html

 

[StevL]

I sold a mounting like that a couple years ago.

It is very safe.

The prongs are kind of large and they hold the diamond against an under-bezel. There is a ring underneath the diamond that it rest against. It is the tension between the prongs and this bezel that hold the diamond securely in place.