Transmute Loot

Casting this spell allows you to convert treasure into an approximately equal number of gold coins. For example, casting this spell will transmute non-magical gems, jewels, paintings, decorative boxes, finely-crafted clothing, spices, etc. into gold. You must be able to touch the items in question throughout the entire 10-minute casting time. As items are converted they disappear forever and are replaced by stacks of gold coins up to 10 coins tall.

The conversion is done at the DM's discretion, and they will likely be rounding down (cost of doing business, etc.). The intent of the spell is to simply deal efficiently with treasure that doesn't "jiggle jiggle" or "fold".