They might be the "Green Laser" variety of C. aeneus, although I've never seen green lasers look that green all over. Could of course be an affect of the tank lighting/flash. And yes special varieties like Green Laser, Orange Laser, and Black tend to have some pretty hefty price tags.
*Edit* ...also keep in mind that it's pretty darn easy to crank up a specific color in Photoshop without affecting others as much. The green in some of the (argh forget the word)...we'll call them condensed pixels...plus the odd violet tone in the gravel makes me a little suspicious of color tweeking, filters or odd lighting.