The vast majority of development in Lab Grown diamonds is in the production of colorless diamonds.
The processes to make diamonds blue are well known. Resources have been devoted to pink lab grown diamonds.
Yellow? It's just not common to find lab grown yellow diamonds. The majority have a prominent orange tint. This diamond escapes that - it looks very much like a natural vivid yellow.
It's nicely cut from a sparkle standpoint - a little deep, so it's not the largest 4 ct diamond you'll see.
It is an I1- the photos really highlight the imperfections. In person, the sparkle pretty much hides them.