Formula X Inspiring Nail Lacquer ($10.50 for 0.40 fl. oz.) is described as a "pearl light turquoise." It's a light-medium, aqua-teal with a metallic finish. This was mostly opaque after a single coat, and it looked the best with one coat of polish as the consistency was also on the thicker end of the spectrum, which made minimizing brush strokes difficult if you had more than one coat. I also had slight bubbling on two nails. Essie Naughty Nautical (LE, $8.00) is greener, darker. MAC Salad Dressed (LE, $16.00) is darker, more muted, less shimmery. Illamasqua Venous (LE, $17.00) is darker, less shimmery. Dior St. Tropez (LE, $24.00) is slightly darker, less shimmery. Zoya Zuza (P, $9.00) is darker, more shimmery. See comparison swatches / view dupes.