You"re using the term conjecture incorrectly. There is no hypothesis or inference here.
This claim - that I believe to be true - is not conjecture, nor is it baseless.
Your opinion may differ, but that's irrelevant. Demanding that I need to explain something so insignificat to the nth degree is a tired old tactic and I won't be baited into a defensive position so easily.
As cleverly stated - they're just rocks.








The seller bought it with a label, before the Internet or netheekery existed.