EMERALDS TO BEADS TO CHAINS TO PEARLS: It is almost too easy to draw a comparison to the sparkles that appear in the skies over the Fourth of July weekend to the many sparkles dotting the tables at the International Gem & Jewelry Show. But let's. Because the show, which will set up shop in Pasadena from Friday, July 2 through Sunday, July 4, has just about everything princess-cut and round and flashy. AND AFFORDABLE FINDS, TOO: The show says buyers will discover things from "$2.00 to $2,000,000." Now that is an impressive spread, but we'll probably stick closer to that first number while ogling the second.