[R] diamonds data set from ggplot2

[Sigbert Klinke]

Hi,

is there any information about the source of this data set?

1.) I read the question of Marina Doucerain in 2012 about the time and 
Hadley Wickhams answer "I believe it was 2008."

2.) In kaggle someone said "It's a Tiffany & Co's snapshot pricelist 
from 2017."

So, where the data set stems from? Which year?

Thanks Sigbert