I really like this medium plus tone level of bright blue green color. The gemstone has one fault. There are a few quite visible growth tubes deep in the culet that parallel the sides of the oval. I remember thinking that tubes like that were rutile in a similar stone years ago, but I am sure they are growth tubes now. Growth tubes are formed when something interrupts the growth of the crystal in the principal axis direction. The rest of the crystal continues to develop, but a tube with flat sides is formed over the area of the c axis that stopped growing. They always parallel the c axis. The oval weighs 1.68 carats and its flash is unaffected by the growth tubes.