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).
1.30 Carat Diamonds
Carat size does not equate exactly to a certain width of diamond, because the diamond may be short and fat, or tall and lanky, meaning 1.30 carats of diamond will not always be synonymous with 7.13 mm of diamond.
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Let us not be too particular; it is better to have old secondhand diamonds than none at all. Mark Twain .
The cost per carat value is a numerical number that provides you with a sense of how much the diamond is worth compared to other diamonds of similar properties. If you're umming and ahhing about whether to get a diamond or another precious gemstone, a relevant piece of information regarding their carat size is that the stones have varied densities, leading to different sizes for stones of the same weight.
You can trade carat size for diamond rarity by doing something like choosing a pink diamond. If you do this, perhaps you'd like to consider putting in a bid for the darya-ye noor diamond which is the largest pink diamond the world, or 182 carats of it. To get it, you'd have to go to iran however..
So how good do you think a 10 carat diamond which looks a horrible uneven black colour would appear on an engagement ring? Exactly - diamond buyers need to also consider other properties such as the colour of the stone, which is not picked correctly can negate any attractiveness of having a very large diamond.