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).
2.18 Carat Princess Shape Size on Hand
Size doesn't always mean a lot until you witness it in person - this page provides a hand as "context" to simulate the apparent size of a 2.18 carat weight diamond of princess shape. Carat weight isn't the be all and end all - the depth of the diamond's cut will also affect the apparent size of the rock; a diamond like this 2.18 carat one will usually be around 7.9 mm . In order to provide you more of an idea of what the picture is showing, the ring shown is a size six in the US sizing system, which is the same as an L 1/2 ring size in places like Australia or Britain.
You'll become more knowledgeable looking at diamond sizes online such as this 2.18 carat weight princess shape diamond, but nothing beats seeing it in person.
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Later after the diamond is purchased, it's likely you may be pleasantly surprised because the diamond appears larger on a woman's hand than you first thought, compared with when viewed by itself .