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).
2.01 Carat Actual Size
If you are wondering how large a diamond with a 2.01 carat weight looks on a hand, take a look at this picture which provides a visual guide to this diamond's size. If you don't want to rely entirely on pictures like this, what you can do is measure the size of your finger and compare it with the 8.3 mm mean diameter for a 2.01 carat diamond. The apparent size of the diamond depends heavily on what it is shown against - the hand - a small hand will make the diamond appear significantly larger, with the reverse applying as well.