The term 'DEEP GLOSSY BLACK' can be summarized as a dark, shiny black color. The crossword solution for this term is 'JET', which is a type of black gemstone that is often used in jewelry and other decorative items. JET is also a type of coal that is formed from wood that has been subjected to extreme pressure and heat over millions of years. JET is known for its deep, glossy black color, making it an ideal material for creating beautiful and unique pieces of art.