Engagement rings: They're a big deal.
And they're also a big business. In 2012, US couples spent around $11 billion on engagement and wedding rings.
Wedding site the Knot recently surveyed 14,000 users to find out their engagement ring habits, and came up with a surprising array of data.
Among the data: People tend to spend around 3 1/2 months looking for an engagement ring, and the most popular rings are round-cut stones.
