“I was cutting my watermelon and was confused when I saw these hard stems inside, does anyone know what they are?”
That happens when the watermelon gets stressed during growing. It was likely due to drought that the fruit got messed up inside. It’s technically edible, but likely doesn’t taste very good.
No, it doesn't look like it's inside with the nail polish.
It's white and gold, not blue and black
I see what you did there.