I think of a broad category of items including strawberry seeds, mustard seeds, sunflower seeds, mango seeds and other "pit"s, up to coconut seeds. I think "sunflower seed" would have been a better comparison, as its something a person can actually visualize, not a 3 order of magnitude spanning category.
If you leave out massive outliers like coconuts (which I highly suspect are not what 99.9% of people think of when they think of "seeds"—I realize that's not the case for you), I think the variation would actually be quite similar.