Vintage Czech gold chain tassle necklace Uranium sapphire blue bicolor faceted glass beads

26" Vintage Czech Bohemian gold ghain wired necklace with a stunning selection of antique hand faceted uranium  sapphire blue bicolor glass beads. Finished with a gold tone chain tassle. This necklace has been restrung using antique beads and is in excellent condition. Antique hand faceted beads will have small blemishes. Authentic vintage Czech costume jewelry necklace ready to wear for any occasion, formal or informal.
Origin: Northern Bohemia circa 1920's

Size beads: 4 - 23mm; 2/16" - 14/16"
Length: 26" approx 

Uranium glass is glass which has had uranium, usually in oxide diuranate form, added to a glass mix before melting for coloration. The proportion usually varies from trace levels to about 2% by weight uranium, although some 20th-century pieces were made with up to 25% uranium.

Uranium glass was once made into tableware and household items, but fell out of widespread use when the availability of uranium to most industries was sharply curtailed during the Cold war in the 1940s to 1990s.

The normal colour of uranium glass ranges from yellow to green depending on the oxidation state and concentration of the metal ions, although this may be altered by the addition of other elements as  glass colorants. Uranium glass also flouresces bright green under  ultraviolet light and can register above background radiation on a sufficiently sensitive geiger counter, although most pieces of uranium glass are considered to be harmless and only negligibly radioactive.

The Baccarat glassworks in France created an opaque green uranium glass which they named chrysoprase from its similarity to that green form of chalcedony.