MAC Sun Rush is a very warm-toned, dark gold with a pearl finish. It is a limited edition highlighter that retails for $21.00 and contains 0.6 oz.
MAC Sun Rush Lustre Drops ($21.00 for 0.60 fl. oz.) is a medium gold with warm undertones and fine, gold pearl. It had sheer coverage, as described, which wasn't buildable, but the effect was still lightly dewy with a hint of shimmer. It was more noticeable in person, though, and it might be more noticeable on much lighter and deeper skin tones than mine (it just blends in quite a bit with my natural coloring). The texture was thin, watery, and easy to spread across bare skin (or over base products with a gentle touch) as well as to mix with things like moisturizer or foundation. On its own, the highlighter wore well for eight hours before starting to look a bit patchy.