Vintage glass pearls Czech double strand necklace

The larger beads measure 5.5mm and remind me of pearls. I’m unsure of their origin and what year they were manufactured, but I’m certain that they are vintage. They are a purplish blue glass that has an aurora borealis (AB) coating that reflects shades of blue, purple, and pink. The smaller round glass beads measure 4mm, and were made in Czechoslovakia during the 1960’s. The eye pins and clasp are gunmetal colored and are NOT vintage.