Are these double yolks?

[MOMof3Noltes]

The last 2 days I have gone out to find 1 large egg from my 2 young hens. I think my Red Star is the only one laying at the time since we only get 1 egg a day. We also have a black giant. Both are about 6 months old. The 2 smaller eggs in the picture are from 3 and 4 days ago. They 2 larger ones are from yesterday and today. Any feedback would be appreciated!

 

[MOMof3Noltes]

Here's another picture of the different sized eggs

 

[ChickNanny13]

Wow that's a HUGE difference in size! It's possible, crack it open Don't know the breed but think JG are "late" bloomers, do both squat for you? If you do crack the bigger we need a picture

 

[Pork Pie]

They could well be double-yolkers. Only one way to find out I guess that you could try and candle the egg in question - never tried when it comes to birds that I know to be double-yolk layers, since I would never try and hatch from them.