The problem with a stockpile's bins being encrusted may be gone.
(https://i.imgur.com/pV0wwXI.png)
If you are using an older DF version where bins can be encrusted, another option to control what type of furniture is encrusted is to rely on relative distance. The encrusting job has the dwarf put the cut gem inside the workshop then the dwarf finds the closest encrustable furniture item in relation to the workshop's location, so if your linked furniture stockpile is closer to the workshop than the binned stockpile, the dwarf should will look in that stockpile first (but, shortest distance might mean 1 z-level down is 1 tile distance).
I attempt to avoid the "too hacky" stuff also, but I do use QSP for some item types because it works for the situation and the more-RP-method does not.
I thought the best way to train a gem setter was to have a glassmaker make raw green glass, then have a gem cutter cut it, and finally have the gem setter encrust stuff with it.
Glass is renewable in that sand doesnt deplete, to a point if you can leverage the distance it requires to travel to reach fuel-less magma or the engineering required in order to bring the magma to a more convenient place its enough with a force of labor to make enough limitless glass material to work your encrusters forever. Green-glass doesnt need pearlash and can be made on the spot and crystal glass needs particular rock crystal boulders.
Overall a profitable silk/plant thread/yarn industry is always industrially advantageous for having high quality bags for sand or anything else around, and fufilling a few needs for your dwarves in having quality fashionwear, which you could also cover in encrusted glass too to raise its value.
There are four options, and each have benefits and drawbacks to my knowledge:
- actual gemstone has the highest value results, but is in limited supply, and rarely produces a craft or large gem the setters cannot use
- stone is a common and ubiquitous byproduct, but may require long hauling routes
Dont forget that you can make perfect gem goods out of metal and other objects on demand in order to quickly satisfy one need or cross over the favorite textures and forms of a dwarf that can't naturally be achieved (though actually using the metal bars to decorate creates studded items)
And that by simply turning economic stones off in your stone preferences, you can make valuable gems out of stones you may not be interested in smelting for above their natural price or high value alloy. Quick, chart off the wiki states.
×1 Bismuthinite, Bituminous coal, Lignite, Common stone
×2 Cassiterite, Garnierite, Malachite, Native copper, Sphalerite, Calcite, Chalk, Dolomite, Limestone, Marble
×3 Tetrahedrite, Obsidian
×5 Galena
×8 Hematite, Limonite, Magnetite
×10 Horn silver, Native silver
×30 Native gold
×40 Native aluminum, Native platinum
×250 Raw adamantine
Obsidian would be pretty good as a mundane or manufactured stone if you were in a suffciently complex obisdian casting station.
By comparison
×1 Ash
×2 Amber, Coral, Coal, Green glass, Lye
×3 Potash, Earthenware
×4 Pearlash, Stoneware
×5 Clear glass
×10 Crystal glass, Porcelain, Salt