Over 150 different styles in stock to choose from. Gallery of Diamonds Location We are located conveniently at 1610 15th Avenue in Longview, Washington. Click on the map for a more detailed view of the street, and the surrounding area. Gallery of Diamonds 1610 15th Ave Longview, WA 98632 360-423-7252 800-700-7252 Home | Artcarved | Benchmark| Fredrick Goldman | Levy Creations | Parade | Parle | Malakan Pandora | Swarovski | Custom Creations Hours: Monday-Friday 9:30am-6:00pm. Saturday 9:30am-5:00pm. Closed Sunday. The Gallery of Diamonds is a full-service custom jewelry design center located in Longview, WA. We can make any of your custom jewelry ideas a reality.