Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Making up for Tuesday's plunge, shares of LED materials producer Rubicon Technology (Nasdaq: RBCN) bounced back today by gaining nearly 12% on moderately heavy volume.

So what: That earlier drop was fueled by analyst comments and produced the biggest trading volume spike Rubicon has seen in its entire history on the public market. This time, the pop looks as if it's driven by a couple of positive article mentions, and it probably didn't hurt that technology titans Google (Nasdaq: GOOG) and Advanced Micro Devices (NYSE: AMD) reported strong results last night, but it's a less material move with less of a solid footing.

Now what: That said, you're sitting pretty if you bought on the drop like we told you. Small-caps like Rubicon are prone to these wild mood swings from time to time, with or without real news to explain the moves. Volatility can hurt you -- or it can be an opportunistic investor's best friend.

Interested in more info on Rubicon? Add it to your watchlist by clicking here.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. Google is a Motley Fool Inside Value selection and a Motley Fool Rule Breakers recommendation. The Fool owns shares of Google. Try any of our Foolish newsletter services free for 30 days. True to its name, The Motley Fool is made up of a motley assortment of writers and analysts, each with a unique perspective; sometimes we agree, sometimes we disagree, but we all believe in the power of learning from each other through our Foolish community. The Motley Fool is investors writing for investors.