ColourPop Gneiss Guy is a warm duochrome with a sparkle finish that is permanent in palette and retails for $4.50. In comparison, Natasha Denona Calypso Blue (05M) is a warm duochrome with a sparkle finish that is permanent in palette and retails for $29.00.
Natasha Denona Calypso Blue (05M) is 90% similar — it is more shimmery, warmer.