Truly Stunning Signed and Dated Craig Zweifel 1987 Studio Art Glass Gold Aurene Iridescent Spiderweb Pattern Vase. In 1987 Craig would have been working from his studio in the Rockies near Ketchum, Idaho. Craig Zweifel’s glass work can be recognized by its distinctive iridescent colors – the result of his signature process, which fuses silver to the molten glass at 2100 degrees, adds overlays of glass to create patterns, then crystallizes the surface. As the surface crystallizes, colors bloom into being – covering each piece with its own singular array of hues. Each piece is signed and dated on completion. Every piece is created individually, and is FREE BLOWN- no molds or machines are used. As a result, every Zwiefel glass piece has subtle variations in color, shape, and surface texture – no two are ever exactly the same, even pieces of the same general size and pattern. The unique aspects of the process make every piece one of a kind. This vase is spectacular! The gold shimmers and the iridescence shows off the subtle hues of color change as you observe from different angles. Vase is in fantastic original condition with no chips or cracks. Please see photos for best idea of condition. Measures 8″ tall x 5″ wide.