C1900 Imperial Russian 14 Ct Gold and Sapphire Cuff Links.
In each cuff link a disk of polished gold contains a cabochon blue sapphire. Each disk is stamped BK on the ring at the back. The central chain link is hallmarked with a kokoshnik mark looking to the right: 1908-1917. It is the round kokoshnik mark for elements weighing under 8.5 grams. The hollow straight tubular guard is not marked.
They may be by the same maker as this bracelet: http://romanovrussia.com/antique/vintage-russian-gold-jewelry-bracelets/. The upper case BK sans serifs, with no pellets and in an oval cartouche certainly matches, as does the kokoshnik mark.
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