Blue Diamond 3 vs Blue Diamond 4

Blue Diamond 3 and Blue Diamond 4 are both Dulux teals. The gap between them is ΔE 3.0 — “near-identical”. Blue Diamond 4 is the lighter of the two, and Blue Diamond 3 the warmer. Both cost about £14.40 per litre.

	Blue Diamond 3	Blue Diamond 4
Hex	#1C8C93	#00939F
Lightness (L*)	53	55
Price / litre	£14.40	£14.40

Looking across brands instead? See Blue Diamond 3’s cross-brand matches and cheaper alternatives, or Blue Diamond 4’s.