The gang held a gun to Kardashian West's head during the early morning robbery, before tying her up and locking her in the bathroom.
They then escaped with an estimated €10m (£8.7m; $11.2m) in jewellery.
Her publicist said the star was "badly shaken but physically unharmed".
The mother-of-two, who became a household name thanks to the reality series Keeping Up With The Kardashians, left France hours later, flying to New York in a private jet.