These are normally used as liners for Antique Silver/ Silver Plated Mustard Pots/ Salts etc. 2 Round Glass liners in vivid Cobalt Blue - sizes in photos.
COBALT BLUE GLASS BOTTLE DECORATIVE vase ... round bubble
Vintage round cobalt blue stemmed glass goblet 11cm high
Vintage round cobalt blue heavy glass goblet 18cm high
Vintage 4 1/2” Round Cobalt Blue Pressed Glass Bowl Star Burst Design (C)
Irena Cobalt Blue Glass Round Ashtray with Gold Decorative Band 5" Dia
Cobalt Blue Glass Bottle Rare Narrow Thick Round 13 7/8 In Tall X 2 1/8 In Wide