The only way a "feather' will evolve into being a larger inclusion,
if a much greater weight is then brought down upon it. When dealing
with Princesses and other stones with corner inclusions, you must
use greater and absolute care.
What do I do? I apply the normal downward pressure on the remaining
3 claws and being rather careful now. I would let the remaining 4th
claw just sit, lean into, or against, the Princess stone. I would
shy away from applying any "extra & equal" pressure as from the
other claws in this 4 claw setting. Basically, "internal feathers"
do not grow with pressure, they are an integral part of the stone.
Also that area might be a weaker area. The stone have the tendency
to 'fracture' further, but not grow as you have previously mentioned
....This is just semantics or choice or words.
I sincerely hope that I have helped you. Gerry Lewy! a.k.a. "Gerry,