All that glitters is not gold; sometimes it is marcasite with Austrian crystals. Heck, it was good enough for Granny to wear to the theater. And now granny's 21-year-old great-granddaughter wants to don the stuff for a night at the clubs. Before the young hussy steps out the door, she should visit Chrisalyn. The rings, necklaces, and bracelets in the display cases glimmer beside other inexpensive gems: amber, rainbow moonstone, rutilated quartz, lapis, onyx, labradorite, and more. And for the six-foot great-grandson with a stylish sense of fashion, there's that long-coveted billfish tie clip and cuff links with five rows of fake diamonds. Most items cost between $18 and $80. Some rings and beaded necklaces go for five bucks a piece.