Once called "a solution for which there is no problem," lasers have since managed to be useful in everything from space communication to eye surgery. As with many useful things, they are now also managing to become useless, which just about guarantees their popularity. Lasers are being employed to make jewelry, the first being dichromate hologram pendants, which are glass discs with three-dimensional photographs embedded in them. The pictures change color and depth with different sorts of light - sunlight, incandescent or fluorescent - and nearly disappear one moment, then reappear vividly with the slightest movement. Thus, you can dangle from your neck or wrist a ghostly King Kong (with or without Faye Wray), a silver dollar, watchworks, a skier, a rose, a peanut with the White House in the background, or your zodiac sign. So far, nearly forty different holographic images are available. You can buy these white light reflective holograms, as they are commonly known, on a flimsy gold-colored chain or have a jeweler turn the plain disc into a piece of jewelry to your specifications, just as long as you wear it so it can catch the light.

Laser Pendants. About $18 to $25.In Washington and Maryland at Tiffany Tree. In Virginia at B & C Jewelers, Clarissa, Isis Adornments, Gift Horse, Jewelcrafters.