Black Diamond Holy Rosary Necklace14k gold rosary cross necklace featuring 52 carats of black diamonds on an 18" chain with 4. 25" drop. The pendant features a halo of hand set white diamond and an image of Saint Mary, the saint of devotion. The meaning of black diamond is transcendence. The gemstone has been symbolized as power, authority, and invincibility. The black diamond transmits these values to its wearer, because it gives strength of character, willpower and self confidence.