Money may not grow on trees, but golden treasure does. Though they are called green Anjou pears, the bell-shaped fruits glistening in the October morning sun on a 20-foot tree at Kiyokawa Family Orchards, in Oregon’s Hood River Valley, exhibit a topaz sheen that makes them look like foot-sized jewels. “They’re on the sunny side of the tree,” Randy Kiyokawa explains of the pears’ golden blush. “Gives them a sort of glow, don’t you think?” I do think. It’s not hard to imagine that their flavor matches their beauty. Pears are evanescent marvels with a range and complexity of tastes, textures, and colors that rival any other tree fruit. But, barely noticed amid the annual new-apple frenzy that modern marketing has brought to U.S. grocery stores, pears are the overlooked gems of fall fruits. (In fact, “Gem” is the variety name for a 2015 introduction that industry figures hope will …