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).
2.42 Carat Princess Shape Diamond Sizes on Hand
Carat weight doesn't tell the whole story - the type of cut will also affect the apparent size of the diamond; a diamond like this 2.42 carat one will usually be around 8.6 mm . If you've got a ring in your possession and you know the size, you can compare it to the US size six ring pictured - this will assist you in getting a better idea of the diamond size in the picture. The visual size for this 2.42 carat weight princess-shaped diamond will be affected not only by the carat weight but as well on the length to width ratio of the ring finger the diamond ends up on.