I have set a couple hundred of these and have taught the
invisible setting technique for the last three years. As with
most stone setting applications there can be many different
methods that will achieve the same goal, but with the invisible
setting Its been my experience that your choices are few and
unforgiving. The stone has opposing grooves that sit just below
the girdle on two of the four sides of the pavilion. The groove
is parallel to girdle and runs the entire length of the
pavilion. The groove is quite small and only about the size of
four or five human hairs. They is no tongue just groves.
The stones sit on a rail system like boxcars on a train track.
Each rail of the track is shaped like the letter " Y ". Each tip
of the Y rail rest in the grooves of the stones, and the girdles
now overlap the tips of the Y and almost touch each other. The
stones are then taped downward into the mounting using a wooden
dowel. The downward force spreads the Y forcing the metal into
the grooves. The diamonds are not free to slide back and forth on
the track because of support bars that run between the tracks.
You should never try to work these unless the original manufacturer has
gone out of business or will not warranty the piece, and the work that
you perform should be done at the customers risk. You can tighten loose
stones by using the the tapping method only after you are sure that none
of the girdles or corners overlap.
The following is an attempt to clarify these instructions. If
stones #1, #2, #3 where almost girdle to girdle, and tapped
downward onto the Y rails the tips of the Y’s would be driven
into the grooves.
#1 # 2 # 3
stone stone stone
Y Y Y Y
I hope this helps,