I came across this and thought it was enlightening. Alexandra Feodorovna's carriage was a coupé coach built in St. Petersburg by Johann K. Buckendahl in 1793. The original, 512 cm long and 270 cm high, is made of oak, ash, birch, lime, iron and steel and is embellished with copper, brass, bronze, silver and gold, its interior is decorated with velvet and silk, with beveled glass windows. It is suspended on four C-shaped transverse springs and sits length- and cross-wise on straps, has seats for the coachman and pages, rear steps for the footmen and folding steps attached to the floor of the carriage. The exterior is upholstered with dark red velvet, applied with sequins, artificial diamonds, tassels and golden embroidery of trelliswork, flowers and foliage. The coach is surmounted by a copper-gilt crown set with pastes (originally aquamarines). The coach was renovated in 1826, 1856, 1894 and 1896 and most recently in 1992-93 through a grant of the Ford Motor Company for a Fabergé exhibition held at the Winter Palace in 1993, when it was carried up the Ambassador's Staircase in pieces and then reassembled to be shown alongside the Fabergé miniature replica in St. George Hall. 7