Vintage art glass Daum France Pate De Verre Iris Vase. Vintage Daum France Crystal Iris Vase. Each Daum crystal piece is made using the rare and ancient "Pâte de Verre" glassmaking technique, which dates back to 5, 000 BC and involves melting many fragments of colored crystal within a mold. This results in intense colors and subtle shading. Handmade in France. Signed on bottom. Measures approx. 5" high and the diameter of the base is 2 1/8". This beautiful Iris Vase is in excellent co...ndition.We are Gannon’s Antiques and Art in Fort Myers, Florida. We are the most active buyers and retailers in South West Florida with a 20, 000 square foot showroom and national recognition. Visit our website for our contact information and watch for more beautiful treasures from the same collection.We buy and appraise antiques and art. This is an excellent example of what we buy and sell everyday