Description Alexandrite Lab Corundum Marquise The Alexandrite Lab Sapphire Marquise is a mesmerizing gemstone that combines the allure of the classic marquise cut with the innovative brilliance of lab-created sapphire. Known for its unique color-changing properties, this alexandrite variant shifts hues under different lighting conditions, offering a captivating play of colors. This material is a lab created sapphire with the color properties of Alexandrite. This is a great alternative to natural or Lab Created Alexandrite gemstones. These are AAA quality. Color Changes under different lighting.