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These ornamentations are in quite high relief, meaning they are raised from the surface, and give the beakers a sculptural appearance. The second set of beakers incorporates palmettes, crescents, geometric shapes, as well as vegetation into the exterior design. Their decoration seems to fall into two distinct groups: the first depicts plant and animals, including eagles, lions, griffins, almonds, and palm trees. The beakers differ both in size, ranging from 8 to 15 centimeters, and also in colour, with some being ash grey, others golden yellow, and also green. Although no two look exactly alike, all have a similar conical shape, thick walls, and wheel-cut ornament. The appearance of the Hedwig beakers resembles rock crystal, or quartz, and they are made of soda ash glass, which is composed of plant ash and quartz sand. Seven of the known Hedwig glasses have 13th- to 15th-century metal mounts. Lierke suggests that notches in the bases of many indicate that they were originally given other metalwork settings, perhaps as chalices, but none of these have survived. A number of the glasses were elaborated into reliquaries, or in one case a chalice, during the Middle Ages, with the addition of goldsmith's work, including those at Namur, Krakow and Halberstadt (see below). an example can be seen in the Treasury of St Mark's Basilica in Venice, which also possesses a rock-crystal ewer in the same style. They were probably made in emulation of the rock crystal carved vessels made in Fatimid Egypt rather earlier, which were objects of great luxury in the Middle Ages, and have also mostly survived in church treasuries.