Blue onyx stone slabs that are derived from white onyx blocks and subsequently painted to achieve the desired blue color are a result of the scarcity of natural blue onyx in Iranian quarries. This process involves carefully selecting high-quality white onyx blocks and applying a specialized dye or pigment to achieve the vibrant blue hue. While these painted blue onyx slabs may closely resemble the natural blue onyx, it is important to note that the color is artificially enhanced. However, this method allows for a wider availability of blue onyx stone, providing designers and architects with the opportunity to incorporate the captivating beauty of blue onyx into their projects, even in regions where natural blue onyx is not readily accessible.