Helen- You are so right. The stone has to fit perfectly for a good
flush setting. If it’s even remotely loose, it’ll never tighten. When
we flush set at stone…We first cut the seat with a ball bur
until the top edge of the stone girdle sits level, just at the edge
of the hole. Then we cut the seat with a hart burr, right below the
upper edge. Then the stone is very gently snapped into place, with a
Next, we use a small polished burnisher made from an old dental pick
to very gently push the edge towards and over the stone. Then we oil
or spit on the burnisher and push it straight down on the edge of the
metal where it touches the stone for a nice crisp finish.
Flush setting is not something I’d recommend for a triangle. The
corners are likely to break unless they are relieved in the seat. The
very the point should have metal over it, but the tip of the corner
needs to be free inside the seat.
Trying to tip or solder the corners in place is also likely to
result in the corners breaking. Flush setting is something we usually
do with diamonds and corundum. We have done this with softer stones,
but with a small mortality rate.
In this case with the seat too big, I’d suggest the same as many
others have, solder a bezel in. Just don’t forget to free the corners
of the triangle before setting with a tiny little ball burr right
into the corners of the stone seat.
Have fun and make lots of jewelry.