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).
0.85 Carat Diamonds
A 0.85 carat diamond is also described as a 85 point diamond.
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In evaluating the value of a 0.85 carat diamond, one thing you can do is work out the precise cost per carat of diamond. The girdle thickness of the diamond plays an important role in determining the apparent size of the diamond - a diamond with an unnecessarily thick girdle will appear smaller than a diamond with a thinner girdle.
For prospective buyers who are really focused on the size of a stone but not the material or quality, consider changing to a different gemstone apart from diamond. Some other gemstones are significantly less dense than diamond, which means for a certain carat weight they will have a larger volume and hence will look bigger to the naked eye. A major rookie mistake in buying a diamond ring is to get the total diamond weight (tdw) and the weight of the centre diamond mixed up - make sure you don't make this mistake.
Gold cannot be pure, and people cannot be perfect. Chinese Proverb .
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.