This 255-carat (≈51-gram) bi-color tourmaline is a stunning gem-quality crystal, showcasing a dramatic dichotomy of colors. One half of the crystal is deep, opaque black—classic schorl—with a glossy, vitreous luster that catches the light along its natural striations. The black section emphasizes the crystal’s prismatic form and gives it a bold, grounding presence. The other half is pristine white, likely resembling leuco-tourmaline, with a soft translucency that allows light to penetrate slightly, creating a subtle inner glow. The transition between black and white is sharp yet natural, highlighting the crystal’s remarkable zoning without appearing artificially altered. The overall crystal is well-formed, with a columnar, elongated shape and defined terminations, typical of tourmaline. At 255 carats, it’s a substantial and collectible specimen, suitable both for display and for cutting into a striking bi-color gemstone. The sharp contrast between black and white makes it a visually arresting example of tourmaline’s unique color variability.