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).
0.24 Carat Weight Princess Diamond Shown on a Hand
This article has a useful picture showing you the apparent size of a 0.24 carat size princess shape diamond, when viewed in place on the hand of a woman. A princess shape stone with a carat size of 0.24 is typically about 3.6 mm long on the side; this can of course vary depending on cut. The illustration in this page has a ring of L 1/2 ring size; this is around the average size for a female.
The size of a female hand can vary hugely - being in public is evidence enough - so this picture can only show the apparent diamond size for a typical size ring. The apparent size for this 0.24 carat weight princess-shaped diamond will be affected not only by the carat weight but as well on the width to length ratio of the finger the diamond ends up on.
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Diamonds almost always look larger when you move them onto a woman's hand; because of this fact, make sure you get a woman in the shop to put one on rather than putting it on your hand, which is probably much larger.