Types classification distinguishes the intrinsic colour generation mechanisms and post‑growth treatments that define the Coloured Lab‑Grown Diamonds market. The primary type is fancy‑color diamonds, produced by deliberately altering growth parameters (e.g., nitrogen, boron, or lattice strain) to yield saturated hues such as pink, blue, and vivid yellow; this category represents roughly 70 % of volume because it delivers naturally occurring colour without additional processing. A secondary type, enhanced‑color diamonds, undergoes post‑growth treatments—irradiation, high‑temperature annealing, or surface coating—to intensify or modify hue; these stones account for about 20 % of sales, offering cost‑effective alternatives for colour‑sensitive segments. The remaining 10 % consists of natural‑color lab‑grown diamonds, where colour emerges spontaneously under standard growth conditions and is limited to pastel tones; they serve niche applications where authenticity of colour origin is paramount. This taxonomy clarifies how each type contributes to overall market size, informs pricing differentials, and guides R&D investment across the coloured lab‑grown diamond ecosystem.