It takes a little bit of haggling, but eventually the hospitaler agrees to give you four potions of cure light wounds for the bone saw; He tries to barter them at market value, but (as a mage acolyte) your knowledge of potions helps you get them at cost. Definitely could have been worse trades.<br/><br/>Once that's done, you settle down and dig in to properly examine the little light-giving crystals... and find out that while they're not powerful magic items, they're very powerfully crafted. From what you can discern, the gemstones absorb light from the sun, and convert it into arcane energy... and then, when the user wraps his or her hand around them, they create cones of light comparable to a bright flame in a bull's-eye lantern. And from what you can tell, the conversion process never loses steam... meaning that one of these items provides light for as long as you can keep it around.<br/><br/>May very well be worth another 20 gold on your asking price, if you word it correctly to a shop-keeper.