Silisiban

local function buildgem(colour, precious)
    -- a lot of other code
    return Prefab(colour..(precious and "preciousgem" or "gem"), fn, assets)
end

return buildgem("purple"),
    buildgem("blue"),
    buildgem("red"),
    buildgem("orange"),
    buildgem("yellow"),
    buildgem("green"),
    buildgem("opal", true)