Check with the supplier to see if your stones have been stabilized with
Opticon fracture sealer. Gold in quartz for lapidary purposes is usually
a by-product of commercial gold mining. The quartz is released from the
host rock by blasting, and this often results in a few hairline fractures.
From your description it sounds as if the fractures may be more than
"hairline." Obtain an understanding with your supplier about that, too.
They shouldn’t detract from the appearance of the finished jewelry.
You can do the Opticon treatment yourself but you’ll need some way to
repolish the stones when you’re done. If you’re purchasing finished
stones the procedure should have been done by the supplier. If properly
stabilized, the stones should easily stand up to skilled bezel-setting.