Accuracy

I am posting a couple pics so I can ask for some help with accurately identifying these beads. They were sold to me (in order of appearance) as:



natural agate

onyx

moss agate

citrine quartz

cherry quartz

iolite quartz



Now, taking what I have learned recently, that means the first 3 are real stone and the last 3 are manmade stones. Or glass I guess. My question is - how come SO many people sell beads labeled as quartz or jade - knowing they aren't? Hmmmm.