The Soul Studs feature 5.5mm Natural Sphene set in 14k Yellow Gold studs. The gemstone ranges in color and can be found in yellow, orange, brown and green. Sphene is famous for having one of the highest dispersion levels in the world. Now what does that mean...it sparkles and displays colorful fire MORE than Diamonds. These studs thrive in low light settings and are best viewed in candlelight. This pair exclusively features the one of a kind 5.5mm yellow sphene and has a total carat weight of 1.54.