MAC Courtly Grey is a moderately cool-toned, light gray with a matte finish. It is a limited edition eyeshadow that retails for $17.00 and contains 0.05 oz.
MAC Rainy Season Eyeshadow Quad ($40.00 for 0.21 oz.) includes these four shades: Arctic Grey (frosted mid-tone gray, Lustre), Courtly Grey (matte cool gray, Matte), Typographic (asphalt black, Matte2), and Rainy Season (light warm gray frost, Satin). This quad is, for as gray and smoky as it is, more neutral than it is cool or warm-toned. I think on cooler complexions, it will turn cooler-toned, but on my warmer complexion, it looked slightly warm-toned overall when applied to the lid. I wore all four shades together, and they lasted fairly well over an eight-hour period--I had some minor (but not as bad as expected) fall out from Arctic Grey but didn't have any issues with the shades fading.
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.