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On the other hand, the size of a .5 carat diamond is approximately 5.2mm. Even though the carat weight is 50% of a 1 carat stone, it doesnât face up twice as small! Likewise, the physical size of a 2 carat diamond (8.2mm diameter) isnât twice as big as that of a 1 carat diamond (6.5mm diameter). Hopefully, this clears up the misunderstanding of carat weight and actual sizes.
The world's biggest diamond depends upon your definition of 'world'. In fact the biggest diamond ever discovered was found floating in space at the core of a dead star. It is 2,500 miles wide and weighs 10 million trillion trillion carats, but at a distance of 50 light years from the Earth, it may be a little inaccessible to count for our purposes.