This product is a certified 4.75 carat natural blue tourmaline/indecolite gemstone with a trillion cut. The gemstone is transparent, with an asterism effect, and is of excellent cut grade. It is sourced from Brazil and has a certification from HR TGL. The gemstone is eye clean and not enhanced, making it ideal for jewelry and watch-making purposes. With dimensions of 9.8mm in length and width, and 6.7mm in depth, this rare and beautiful gemstone is a unique addition to any collection.