Drinking glass - light uranium/manganese

9 lovely antique, facet-cut 'paraplu' liqueur glasses or cordial glasses from the late 19th century. This specific model with a funnel-shaped bowl and a tapered stem is traditionally referred to in the Netherlands as a paraplu glass. 3 large and 6 smaller, all with a knop in the stem. In good but used condition considering the age of these glasses
Sizes and weights vary slightly from piece to piece; they are handmade and contain to a small extent uranium or manganese. Several items have a light purplish glow in the glass
One glass has a couple of air bubbles in the foot and a glaze defect?
Height: about 13.5 cm. Foot diameter between 5.5 and 6 cm; the bowl between 6 and 7 cm and the weight ranges from 72 to 108 grams
Total weight: 816 grams
See photos for a good view; they form this description together.