Wedding Ring Stretcher / Reducer

[Skieferins]

Hello,

I am thinking about trying to make one of these watch fobs...I am wondering if I were to make a basic ring, then resin a Bloodstone and an Onyx either side of the ring, then use a Wedding ring stretcher/reducer to bow the metal around/over the stones, would the Bloodstone/Onyx be able to take gentle presure , just enough to encase them with the ring/surround or would the stones break ?

I get that the stones are 7 on Mohs and the steel is 4-5 Mohs but if pressure is applied, does this mean the stones can withstand the pressure of the Wedding ring stretcher/reducer...or am I better to burnish the stones in place ?

Thank you