Why use a saw-blade in a 4-claw setting? => 11 photos

 Here are two examples of preparing a seat for a gemstone. This can be for genuine stone or a Diamond, "the following rules for both are still the same". The errors lay in the angles & placement of the bur against the claws.

 What happens when the 'seat' is improperly prepared? The next question is, "How can this error be repaired?"

 The very first thing that is required is to have a saw frame and a saw blade of #4/0 width (number #6/0 is too thin for what we will be doing). Nothing else is needed!

 Here are a variety of useful blades, but only one will be used for this procedure.

Under my digital microscope, you can see the teeth of a saw blade.

 With some of the sample saw blades that I have. I will select only the finest & most useful blade, and that will be used for this delicate procedure. I chose #4/0.

These 'spaces' are not truly accurate for any gemstone setting.

 

 With the #4/0 width blade, I will endeavour to recut the claws above the Girdle and against the Girdle Facets.

 Here is the close-up of where the saw blade will be cutting. This saw blade is repairing the 'seat' of the claw.

 The tip of the claw will be gingerly 'recut' just to reshape the inside of the claw where it touches the stone.

 The whole process is to establish a new contact of metal to the stone. (I learned this technique 66 years ago.) 

 I'm using a different angle to show you where the saw blade will be cutting. This saw blade is similar to using a file, where no file must and cannot touch.

 If the stone angles are not at first configured accurately, there will be errors in the setting of the stone. Knowing the process of how to correct that error is 90% of setting the expensive diamond.

 The angles of the claw MUST ALWAYS MEET THE ANGLES OF THE GEMSTONE.

I always use a pumice wheel #180 grit to smooth the claws.