Neither is authentic, I'm afraid. The one on the right doesn't really come close as a copy - it would be very unusual to have a combination of different coloured eyes like this. The one on the left is a bit more convincing; the surface has been nicely "aged", but it's still wrong, as are the cutting marks around the perforation. The dates are off also; jatims were definitely not made into the Majapahit era.

Here (attached) is a group of authentic beads that range in size from 16-36 mm.

Best,

Will