[sexobon]

Sorry monster.

… Use a flashlight. Why do we love diamonds so much? Well, for one thing, they sparkle! Turn off all of the lights (or wait till night time if you’re looking outside), and get out your brightest, tight beam flashlight. … This trick is especially effective on hard floors and it is one of the first things we try anytime we need to find a gem on the ground. ...

… Fluorescence is your friend. Many diamonds will give off a colored luminescence when placed under ultraviolet light. This is normally invisible, but you can use a black light in a dark room to make the effect stand out. A diamond with strong blue fluorescence, for instance, will exhibit a blue glow in under a black light making it much easier to pick out from its surroundings.