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).
1.43 Carat Princess Shape Size on Hand
This page provides you with some concept of how large a 1.43 carat weight princess shape diamond will appear when seen on a typical female hand. A princess shape diamond with a carat weight of 1.43 is typically about 6.5 mm long on the side, although this can depend on the depth of the cut. The picture on this page shows an L 1/2 ring size, which is typical or perhaps on the small side of typical for a female ring.
You'll become more knowledgeable looking at diamond sizes online such as this 1.43 carat weight princess shape diamond, but nothing beats seeing it in person. The apparent size for this 1.43 carat princess diamond will depend not just on the carat weight but also on the width to length ratio of the ring finger it is placed on.
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Diamonds almost always look larger when you place them on a woman's hand; because of this fact, make sure you ask a female shop assistant to put one on instead of putting it on your hand, which is probably much larger.