Idea for an Newgrf: Jewelers Industry

[MlemandPurrs]

Idea No#1 Jewelers Industry
takes Gold and Diamond outputs Valuables. Supply is finite unlike Banks.
Banks produce and accept valuables like as if temperate. You can haul Valuables from Jewelers to Banks instead hauling the gold directly to the bank.
If it helps i thought this as an addition for Town and Industry set as it became an staple of my playthroughs.