French investigators are trying to determine whether the same group of people being questioned is responsible for this theft as well.
A couple of weeks before the Harry Winston heist, a diamond ring estimated at more than $800,000 was stolen from a Cartier store in the same area. In that crime, a couple of alleged tourists from Qatar entered the store and asked to see several jewels of great value. The couple managed to spirit away a ring mounted with a 5.5-carat diamond and replace it with a fake.
A 55-year-old woman and her 40-year-old son were arrested in nnorthern France last March for this theft and are awaiting their trial in a French jail. But the diamond ring was not recovered.