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).
1.25 Carat Diamonds
To convert the weight of this diamond in carats to milligrams, you multiply the number of carats by 200, in this case multiplying 1.25 carats by 200 to get 250 mg.
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1.25 carats in a diamond gets you around 7.04 mm of diamond, give or take. Carat weight is not the be all and end all of picking a diamond which looks as big as possible. The diamond's girdle thickness will also play a role in affecting what the diamond looks like.
Something that can catch out men searching for a diamond for an engagement ring is forgetting to take into account where the diamond will eventually be displayed - on a woman's hand, which is usually quite a bit smaller than a man's hand. 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.
The story of Harold Ross, the New Yorker and me is a mere footnote to the story of our time, and we might as well face the truth that to researchers of the future, poking about among the ruins of time, we shall all be tiny glitters. But then, so are diamonds. James Thurber .
People say the four cs for a reason - diamond carat size is just one of the four cs and the others are arguably just as important in determining how 'attractive' and 'good' a diamond is.