A&D Gem (Jewels by A&D) is bringing back the "Guess a Gem" contest at The JCK Show in Las Vegas, scheduled for June 1-5. The contest tests the ability of jewelers and gem dealers to guess the combined weight of three different gemstones of different sizes without touching them. The top three guesses win prizes, including a "Jewelry Legal 2-Way Electronic Scale." The game will be played at the A&D Gem "island booth" #34233 located in the AGTA Gems of the World Pavilion. For information, call A&D Gem at (800) ADGEM-32.