WalnLiz
In remembrance, April 2024
You can get away with 450 but just give it a little sideways shake at the hopper box end every dozen or so shovels full of gravel. Putting a 1/4" sieve at the end is always recommended with Sapphires as no banker will catch 100% of the these stones. I do this myself and out of every 10 Sapphires in the box 1 makes it through to the sieve.....usually the rounder ones.
Cheers Wal.
Cheers Wal.