Based on the write-up I did several months ago 100,000c per hour is achievable for a gleam farmer doing their own processing with diamond hammers and appropriate buffs for both the harvesting and the processing.
With a fully forged topaz speed hammer and energy buffs, I’ve not tested whether or not you can make this figure selling raw gleam for 1c per block.
I do know that using diamond hammer with mega speed and persist, you can take over 50k per hour easily at this price. Simply by switching to starberry you can accelerate that a bit, and moving to sapphire or topaz will add speed accordingly.
I’ll test soon but it may be possible. In this context it’s only stated as the name of another facility also located on serpensarindi 