Quick and Easy Buying Guide
Carat weight: 1 carat = 200 milligrams = 6.5 mm diameter. Doubling weight doesn't double diameter.
Diamond clarity: FL/IF/VVS/VS = super expensive, near perfect. SI = best value if you can check a photo for obvious inclusions (defects).
Color: D-G = colorless, expensive, only if you have money to burn. H-J = best value. Can go lower in gold metal settings than white metal.
Cut: Better cut ratings let more light into a diamond, making it sparkle more. Very important property, don't skimp here.
Set a budget and minimum cut (Premium). Go J color for gold and I/H for white metals. Go searching for SI1/SI2 clarity diamonds at James Allen. Pick a diamond with small/no inclusions. Choose a ring setting and buy it risk-free (60-day returns).
Rachel Bilson Engagement Ring
Rachel Bilson first came to worldwide attention through her role on the short-lived but immensely popular series the O.C., which canvassed the lives of a selection of high school kids in the Californian community of Orange County. She dated her co-star on the show Seth, but their relationship ended before the series. She became engaged to Haydn Christensen in 2010, the star of the Star Wars prequel movies who played Anakin (and in theory Darth Vader briefly at the end).
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Haydn proposed to Rachel with what looks like (from the photos) a round solitaire ring, around the 2 carat range. Simple and elegant.