Definition of nebula for English Language Learners. : 1  a cloud of gas or dust in space that can sometimes be seen at night. : 2  a group of stars that are very far away and look like a bright cloud at night.
That could be one reason the national average spent on an engagement ring, as well as diamond carat size, or weight, have been rising. The average spent on an engagement ring grew 3% to $5,598 last year from a year earlier, according to TheKnot. That's still down from 2009's average of $5,861, however. The average carat size for the center stone is just over 1 carat. The average total carat size for engagement rings, including any diamonds on the setting, is 2 carats, Miles said. 3. Weigh payment options.
Typical costs: 1  For an engagement ring, on the low end, expect to pay $125 to $500 for a quarter carat, or smaller, solitaire diamond set in 14-karat gold, or for diamond alternatives such as other gemstones, moissanite or cubic zirconia.