TSP refers to trillion side stones - describing synthetic spinel gems cut in a triangular shape and set as accents. Their compact, sparkling outline strongly contrasts solitaire center stones. With 57 meticulously calculated facets, TSP spinel unleashes remarkable light patterns. The transparent material splits light into spectral colors known as fire. TSP spinel elegantly frames rounds, cushions, and other cuts. For added allure, designers often embellish with scintillating TSP spinel.