Hi Strawberry (fella berry cyster...)
I wasn't sure of what the hard white shell was either so I decided to look into this matter more.
Here is what I found:
PCOS (Polycystic Ovarian Syndrome) gets its name from the many cysts that form in the ovaries. A normal ovary is soft and pink whereas a PCOS ovary has a hard, pearly, white shell around it.
And here is a good link with more photos, explanations and what an ovary looks like after it's been drilled.....
hard thick pearly white shell