||In the New Kingdom Era, especially during the Eighteenth Dynasty period, a booming production and use of blue glass took place and seemed to have limited the use of lapis lazuli in ancient Egyptian art. One of the most famous examples to take into account is the golden funerary mask of Tutankhamun, which contains a mix of both blue paste glass and real lapis lazuli. Knowing that the lapis lazuli was very precious and very much used in ancient Egyptian history and that it was mostly brought to Egypt from Afghanistan via the Levant, the investigation raises several questions about the use of blue glass inlays instead of lapis lazuli. Therefore, this research has several objectives and will focus on the Eighteenth Dynasty period. The analysis will involve conceptual, textual and economical objectives. Conceptually, the research examines the significance of both lapis lazuli and blue glass in Ancient Egyptian art items. The textual goal underlines the significance of lapis lazuli and the color blue in ancient Egyptian religion and culture. And finally, the economical objective focuses on the causes behind the sudden production and use of blue glass.