This next (ultra difficult) example of metal cutting was this insanely technical pattern. These two examples of metal cutting were done in plain wedding bands. The possibilities for errors in cutting are about 90%.
We, the group of 6 diamond setters in one private room, were then made an elite group of individuals. Let me first tell you that the stress level was quite high. If one setter made an error in gemstone setting, the rest of us knew about it in seconds. (Profanity was kept to an absolute minimum.)
This particular 'Scale of Difficulty' is estimated at about '15 out of 10'.
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After drilling the initial hole, I inked where the 5-pointed star would be placed & cut.
As shown in my previous essay, my Onglet graver used my 'inked pattern' as a guide for my design. My graver will DEEPLY cut the pattern, while leaving the '5 inked spots' for making new Beads.
I start my metal cutting from the hole. If I start any place else, I could have lines in the metal made from the Onglet base of the blade. 'Cleanliness is paramount.
I scribed in the metal, 5 more spots, why MORE? These 5 spots are where the 'outer star' pattern will be situated & then cut.
With great care, I started the final STAR pattern. This outer design must be EXACTLY positioned, allowing the design to be made.
All of these cuts should start at the hole. If the base of the graver touches the metal, a faint line will then appear. This faint line will cause many problems in cleaning.
These two 'STAR points' should be in line with each other. The outer STAR is more important than the inner cutting. It is THE FINAL PATTERN REMAINING TO BE CONTINUALLY SEEN.
BRIGHT CUTTING
We've finished with the outline, or 'rough cutting'. Now comes the intricate metal carving.
YES, I will use all of the edges & corners of the Flat #40 graver. I make sure that all of the points of the 2 star-points coincide with each other. I will use my Onglet #2 points to help me in this procedure.
I'm using both the Onglet #1 & #2 gravers to execute all of the deep & straight lines in the metal. My graver cutting starts just beside the new beads. I don't want any gravers to make any faint lines in the metal. Cleaning them could be a major problem.
If you are exceeding in using your Flat #40 graver, then by all means do a few 'touch-ups' where necessary.

I'd suggest doing any fanciful touches (Milgrain) prior to any stone setting.
REMEMBER, start your cutting where the hole is. This will avoid any problems in ruining the new beads.
BIG MAJOR WOOPS! Why?
The 'two points of the stars' are not joining each other. This will cause you many problems, but how can this be repaired?
The only solution is to recut the metal...GENTLY, where the points should be. Carefully, lean your graver to one side and then gently recut where necessary. Don't use your Flat graver to fix it. I won't.