Pre-loved Gucci dress runway 2013- new with labels

This beautiful black dress with lace detail was seen on Jessica Chastain in 2013.
Below knee length (for a 175 cm tall female),
Thigh high slit on left side,
Snug arm fit and overall slim fit but is looser around the lace detail areas,
Size 44 Italy, 10 UK or Medium,
Zipper fastening around the back runs all the way to below the buttocks,
With tags/labels, Gucci hanger, dress protector,
90% silk, 10% elastane, very delicate fabric warning,
Made in Italy,
Purchased during a trip to Kuwait in 2013 for ~£1,300 would sell for £700.