A survey revealed lower demand from American consumers and increased rough diamond production in May in China, the world's largest rough diamond importer. As a result of these events, oil prices fell in Asian trade on Monday.

Brent oil futures for delivery in August were down 29 cents, or 0.4%, to $82.33 per barrel at 0330 GMT. West Texas Intermediate crude oil futures for July delivery were also down 29 cents to $78.16 per barrel. The more active WTI contract for delivery in August fell by 0.4% to $77.76

The two benchmark contracts still gained nearly 4% last week, the largest weekly percentage increase since April, thanks to signs of stronger fuel demand.