A massive €102.5m in jewellery has been stolen from an exhibition at one of the French Riviera’s top hotels.

French investigators have found jewels valued at €18m hidden in a Paris rain sewer – part of the spectacular 2008 heist from luxury jeweller Harry Winston’s Paris boutique.

A reward of up to $1m (€770,000) was offered for information leading to the recovery of diamond rings, necklaces and watches stolen in an €8m robbery in Paris.

The insurer Lloyds of London is offering up to £676,726 (€777,569) for information leading to the recovery of jewellery stolen in a £73m (€83m) heist from the Harry Winston boutique in Paris last week.