TSP stands for trillion side stones, describing crystal glass cut into a triangular trillion shape and set as accents. Their compact sparkling outline contrasts beautifully with a main center stone. With 57 meticulously placed facets, TSP crystal glass casts gorgeous light patterns. The transparent material disperses spectral colors known as fire. TSP accents frame round, oval, princess and other center stones elegantly. For added allure, designers often incorporate TSP crystal glass as embellishments.