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).
Actual Size of 0.65 Carat Princess Shape Diamond
Carat weight doesn't mean much until you witness it in context - this page uses a hand as "context" to simulate the apparent size of a 0.65 carat size diamond of princess shape. Carat weight doesn't tell the whole story - the type of cut will also affect the apparent size of the rock; a diamond like this 0.65 carat one will usually be around 5.1 mm .
The illustration in this page shows an L 1/2 ring size, which is typical or perhaps on the small side of typical for a female ring.
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The size of a female hand can vary hugely - just look around you when you're next in public - so this picture can only show the apparent diamond size for one particular ring size. The visual size for this 0.65 carat princess-shaped diamond will be affected not only by the carat weight but also on the length to width ratio of the ring finger the diamond ends up on.
If you're a male trying to calculate the right size of diamond to get your other half, remember that the stonewill usually look much bigger on her smaller, more petite hands.
