Sparks

Herkimer came in while I was sharpening my axe, sparks flying off the grindstone. I shut it off, and as the motor wound down, Herk said,

I told Tildy I was thinking about new diamond earrings for her birthday, but she has such a sparkling personality that giving her jewelry would be like sending coal to Newcastle. I thought she'd be flattered. There is a difference between "sparkling" and "sparks flying."