The front of this Tsar Alexander I era gold cross is covered with a sky blue opaque enamel within a black enamel border and is applied with a gold Corpus of Christ.
Jewelry with blue opaque enamel was fashionable during the Georgian era of the first two decades of the 19th century.
Russian jewelry from that period is very rare, especially enameled pieces.
Engraving on the back of the cross, is an abbreviated inscription in Russian, which reads:
Length without suspension ring is 36 mm (1 3/8 in.)