MAC Amethyst is a very cool-toned, dark purple with a satin finish. It is a limited edition eyeshadow that retails for $17.00 and contains 0.05 oz.
Amethyst is described as a "deep purple with pink pearl [with a Satin finish]." It's a muted, medium-dark bluish-purple with a satin finish. It had semi-opaque coverage with a dry, firm texture that was hard to apply and blend out. The color lasted for eight hours on me. LORAC Ash (LE, $19.00) is darker, more muted (90% similar). MAC Light Violet (LE, $32.50) is darker (90% similar). Anastasia Soul (LE, $12.00) is more shimmery, lighter, brighter (95% similar). Terra Moons Royal (P, $6.00) is less shimmery, brighter, warmer (85% similar). MAC Stay Sultry (LE, $17.00) is darker, warmer (85% similar). Cle de Peau Cosmic Aura #4 (PiP, ) is darker (85% similar). MAC Exotic Purple (LE, $17.00) is darker, warmer (85% similar). Benefit Always a Bridesmaid (P, $20.00) is warmer, darker (85% similar). MAC Cheers My Dear (LE, $21.00) is less shimmery, warmer (85% similar). MAC Ron Ron Run (LE, $17.00) is darker, brighter (80% similar). See comparison swatches / view dupes side-by-side.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
M·A·C Eyeshadow is a highly pigmented powder formula that applies evenly and blends well. Suitable for use either wet or dry, it's available in a wide variety of textures and finishes.