However, black diamonds are typically completely opaque. Rather than having scintillation, these black stones have a captivating, lustrous shine. Because they have such distinctive qualities, black diamonds can't be graded by the 4Cs (diamond cut, color, clarity, and carat) in the same way colorless diamonds can be.
Appearance: Diamond slices are thin, flat pieces of rough or semi-processed diamond. They typically have a natural, unpolished look with a translucent or opaque appearance, displaying the raw beauty of the diamond.
Formation: Unlike cut diamonds, which are faceted to enhance their brilliance, diamond slices retain their natural texture and irregular shape. They are often sliced from rough diamonds and then used as they are, or with minimal polishing.
