Dear all contributors on this subject!
If you are supplied an item with the thickness is less than adequate
(re: .65mm). I would now personally ask my jeweller to supply and
solder a "THICK" jump ring to the underneath section of the gold
where the hole is located. A simple thin J/R will not suffice. If
you want security and being able to set this stone in question get
at least .75mm J/R PLUS the item in question.
So now you are talking of 1.4mm in total. NOW you can do all of your
drilling, bearing cuts, hammer setting, filing, emery paper
finishing with no worry of finding that the stone will fall out from
polishing. I would ask you to use a very new "156C" undercutting
bur. As this new bur has sharper teeth and you won't be needing to
keep looking for a bur that is old and worn down..
You should just open up the hole to about 80% of the diamond THEN DO
YOUR SOLDERING. Why? Why save the gold if you have to remove it
after putting in the J/R afterwards? Also, this way your jeweller
has better idea of the size of J/R to use. Why am I asking for a
thick J/R? Its because of your need of a seat for the Girdle. Plus
metal for the Pavillion to sit AGAINST...do you all concur?..:>)
"Gerry, the Cyber-Setter!" who is coming out with a "3-book series"
on "Manual of Diamond Setting"!