A hunt is under way to find the four thieves before the jewels - which once belonged to French royals - vanish for good.
The BBC's Hugh Schofield is outside the museum in Paris where the "extraordinary, daring and brazen" robbery took place.
The lamps were lit in the northern Indian temple town of Ayodhya, Uttar Pradesh, on Sunday ahead of Diwali, the Hindu festival of lights.
The US and Russian presidents announced on Thursday that they planned to meet in Budapest.
The Louvre Museum in Paris remains closed to the public after robbers stole imperial jewels in broad daylight on Sunday.
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