2012 Engagement Ring Trends  \\ © Martin Barraud\OJO Images\Getty Images(© Martin Barraud\OJO Images\Getty Images)

Engagement rings are more trend-proof than other types of jewelry, but that doesn't mean styles stay static. Choices in these sentimental stunners have lately expanded to include dazzling color, tributes to the past and even a bit of social conscience. Read on for the latest and loveliest in betrothal baubles.

Halo Settings

The halo is heavenly and there's more than one reason why. First off, this style skews a little vintage, which has been a popular engagement ring trend for a few years now. Plus, Natalie Portman sports a double-halo ring, so there's some celeb buzz for the shape. The unbroken circle also symbolizes the unity of the happy couple, and, on a more practical level, those framing stones make the center solitaire appear larger, which is never a bad thing. (That main stone need not be a diamond — Kate Middleton's engagement ring is a modified halo with a big blue sapphire taking center stage.) You'll usually find this setting paired with relatively slender bands typically embedded with pave stones or rich milgrain work. The most of-the-moment variation uses colored stones as the halo while the center stone shines clear.