Some of the issues are caused by names and languages.

“When I use a word,” Humpty Dumpty said, in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.”
“The question is,” said Alice, “whether you can make words mean so many different things.”

Do you remember the quote from Barbara written down during her visit to Beijing Geological Museumlisting all the different stones and minerals that are considered "Jade?" 14 materials, only 2 that we'd call "jade."

At Tucson a few years back a Chinese seller was *trying* to differentiate between real and imitation turquoise. One pile was labeled "Natural Turquoise." The other pile labeled "Stabilized Turquoise."

In reality the first pile was actual turquoise but stabilized with clear resin. The 2nd pile was blue dyed magnesite that was probably also stabilized with resin. Neither pile was "natural."

Buyers and sellers both need to ask questions and learn the differences.