1 coat each
2 coats of each
$7 vs $1
Thick vs think
St. Lucia Lilac has more blue and is paler, and Lilac has more purple.
0.5 oz / 15 ml vs 0.35 oz
The E.L.F. one is nearly 1/3 less, not that most people really use up whole bottles of nail polishes all the time.
After trying Lilac and Blue Mist, I can safely say that the E.L.F. $1 nail polishes are very poor quality. They take forever to dry and chips very easily. They're also very sheer. If you want a pale lilac, the ones I've seen in the drugstore mainly are from Sally Hansen and Revlon, although I think you have better luck with Sally Hansen.
St. Lucia Lilac after 5 days of wear