
No, that would make it a metric size rather than "imperial" (Hah! USAians) sized.
Ring doughnuts, custard doughnuts, jam doughnuts, iced doughnuts and various other types of doughnuts all have their very own DIN/ISO standard size. This rock is very specifically jelly doughnut sized which in proper metric measurements is 1.023 jam doughnuts.