I was given a man's ring with a 1.25 ct. round diamond set in
a 14 kt White gold gypsy mounting with 3 small diamonds approx. 5
pts. each pave set down each side. The ring is rather thick and
is a size 6 ?. It needs to be sized to a 10 ?
This should not be a problem, in 20 years I have never seen a
diamond in such a ring chip from sizing when proper care was taken.
If you cut it at the base, bend it open with your half round pliers
( leaving it a bit oval if its super stiff, don’t pound it down
your mandrel to open it to size). You will need to create
approximatly a 12mm opening, fit you peice in and solder
(dovetailing always creates a stronger joint). The problem you may
encounter is brittle gold. Old white gold often becomes brittle and
cracks at stress points, you may have to solder those also. Check
to be sure the culet doesn’t protrude, thats always a risk if it
hits the steel mandrel it will chip.