An antique Russian gold, pearl, diamond and sapphire Renaissance Revival brooch

by Frederic Koechly, Court jeweler to the Tsars

St. Petersburg, circa 1890

Length 2 3/4 in. (6 cm)

Marked with 56 zolotniks Russian Imperial gold standard (14 Ct – 583 gold), St Petersburg city arms, and master’s initials ‘F * K’

The name is also spelled – Friedrich Köchli. There is a rhodonite egg by FK in the Royal Collection (bought by Queen Mary).