NARS Buenos Aires is a moderately warm-toned, medium beige with a pearl finish. It is a permanent lipgloss that retails for $24.00 and contains 0.09 oz.
NARS Buenos Aires Velvet Gloss Lip Pencil ($24.00 for 0.09 oz.) is described as a "nude beige pink." It's a light peach beige with a subtle shine. The color coverage is mostly opaque. It's not quite as glossy or as shiny as other hues within the Velvet Gloss Lip Pencil range, though. MAC Naturally Eccentric is lighter. MAC Peachstock is darker, more orange. Guerlain Guerlinade is slightly darker. What I like about the color is that it's more universally wearable--it's not so pale and light that it becomes the kind of nude that can easily wash out complexions. There's enough warmth, color, and opaqueness to give lips a lighter look without washing them out.