The product is a 9.50mm round cut loose London Blue Topaz gemstone weighing 3.90 carats. This natural gemstone has excellent cut grade and slightly included clarity grade. It is certified upon demand and comes as a single piece. Known for its beautiful blue color and origins in London, this gemstone is perfect for adding a pop of color to any jewelry piece. Its round shape gives it a polished and elegant look, making it a versatile choice for various jewelry designs.