Once before, I posted a stone that I thought might be jasper but wasn't sure - it was. Today's stone is one that, for years, I thought might be a red agate. It's not - I know better now. This is red jasper.
The reason I thought it might be red agate is because, as a teenager, I plucked it from the water on a stone beach very close to some islands where there was an abandoned agate mine. Since my last post, I have learned how to tell the difference.
Another view and now for comparison's sake, a photo of it beside the other jasper. The other one has been coated with something shiny. This one is the reddest stone I have ever seen.
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References
What is Jasper?
What is the Difference between Agate, Jasper and Chalcedony?
Images
Photos from the Canon SX620 HS of 
@kansuze