There is an old adage, "If you hit it too hard, it will become flat", well there is truth for this setting technique. 'DON'T HIT IT TOO HARD'!!! As you won't have any chance of Bright-Cutting the inside-edge of your Channel's trough,,(and I have photographs to prove it!) If you have the chance of using your reciprocating-hammer, please use your 'lightest pressure level that you have'.
You can set either Diamond or even the softer Emerald, Ruby or Sapphire gemstones but "pounding the guts out of your ring", won't make your Channel-Set ring w/stones look nice at all! Just never use your hammer right near the front-leading edge of the channel, why so? Lets just say; if your hammer is not hitting in one spot, it might & could slip off the metal off & touch those soft stones.."woops! good-bye stone, very costly!
In my following 'pictorial-essay', I will attempt to show how to prepare & initiate the Channel Setting procedure! In this essay only, I am currently showing you, what the ring will look like if certain setting rules are not followed! Remembering, Bright-Cutting would be "advisable" in the finishing of any Channel-Set ring, That even goes for a pendant with 3, Princess-Cut stones..nice, clean looking & still Bright-Cut inside the Channel frame!