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).
0.76 Carat Diamonds
The diameter of a 0.76 carat diamond is approximately 5.95 mm.
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The width of the diamond grows much more slowly than the carat weight of a diamond.
Diamond carat size doesn't narrow down your list of diamonds very much, what you really need to do is consider what the other desirable properties of the diamond, decide how good these properties have to be for your situation, and then search for diamonds which meet all of these property requirements at the same time. There's a lot of hearsay on the internet about the average size of a diamond used in a typical diamond engagement ring - it's around half carat - but that of course doesn't give you any information about the typical clarity or colour of the diamond, and that in itself should tell you how useless that statistic is in isolation.
Sometimes diamond searchers will switch to coloured diamonds in a quest to perhaps get a slightly larger stone, although coloured diamonds are not always cheaper than white diamonds. Huge coloured diamonds do exist, such as the red cross diamond, a 205 carat yellow diamond. Note when looking at total diamond weight, some of the online stores such as blue nile will give a total diamond weight for a pair of stud earrings, but the actual total diamond weight will only approximately be what is specified - check the fine print to avoid being caught out.
Next to sound judgment, diamonds and pearls are the rarest things in the world. Jean de la Bruyere .
First-time diamond buyers who are in a hurry often just focus on the diamond carat size, which is a big mistake - other properties such as the clarity of the diamond are important in getting a diamond which is attractive not just in terms of its size, but also its appearance.