Okay kiddo, let me explain what a jack of diamonds artist is.
You know how there are a lot of different types of artists, like painters and sculptors and musicians? Well, back in a time called the early 20th century, there was a group of artists in Russia who were called the jack of diamonds artists.
These artists were all about making really colorful and bold art that would grab your attention. They liked to use lots of different shapes and patterns and colors in their paintings.
The reason they were called the jack of diamonds artists is because they liked to use a lot of diamond shapes in their art. And the jack of diamonds is a playing card that has a diamond shape on it.
So, in summary, the jack of diamonds artists were a group of artists who lived a long time ago in Russia and liked to make really bright and colorful art using lots of diamond shapes.