I too really like the diamond grips.

A friend just had his Francotte restocked and requested this grip style and man if feels nice!



Also, I've owned some older Grullas in the past that had diamond shapes..... even though these guns didn't have straight grips... but they weren't full pistil grips either. More like POW.

You can clearly see the ridge (the "corner of the diamond") running down the side of grips.


On a Grulla BLE 20ga









On a Grulla SLE 12ga