NARS Shade IV is a slightly warm-toned, light-medium red with a pearl finish. It is a limited edition lipgloss that retails for $26.00 and contains 0.18 oz.
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Shade IV is described as a "sheer ruby." It's a muted, medium-dark red with subtle, warm undertones and a very fine pink-red shimmer. It's more semi-opaque than sheer and once on, actually has more of a faded, muted quality to it than when swatched. It looks almost pink-red applied to me. It lasted for four hours on me. See comparison swatches / view dupes.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this product!