These smooth beautiful little stones came from the shores of Friendly Cove (Yuquot) by way of a cousin who worked on the MV Uchuck III.
It's on my bucket list because it has such an interesting history and was ground zero for the Sea Otter trade. I'm sure I'll bring a bucket when I get there.
Anyways.. I only use Sterling Silver on all my jewellery.
I never tumble what I use. They have just been smoothed by the sea. See photo for measurement in both cm or inches.