Teal (common colour name) Blue (Hue)(Hue) with medium through dark (Lit) and weak through moderate (Sat) that contains a tinge of green (greenish blue or green-blue), resembling the wing feathers of the teal (Querquedula discors), a small duck which is common East of the Rocky Mountains. In the diamond trade, the name teal is usually applied to blue-green (B-G) and green-blue (G-B) hues of a bright tone although teal can be applied to a range of bluish green (b-G) through greenish blue (g-B) hues that exhibit dull or deep tones.