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).
0.30 Carat Diamonds
Counter intuitively, a diamond that is twice as heavy as another diamond is a lot less than twice as big in terms of its diameter.
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Big girls need big diamonds. Liz Taylor .
If you've been searching for a diamond of a particular size, such as this 0.30 diamond, consider adding other terms to your search enquiry in google or another search engine, for example "g color".
Although it is not a problem for most people, it is possible for a diamond to be too large. This is much more likely to happen with women who have particularly petite hands. Some unethical store assistants will talk about average diamond size in trying to pressure couples into buying a diamond ring more expensive than they can afford - even though the average is around half carat, you should be buying a diamond based on what you can afford, and what you as a couple would feel comfortable buying.
Don't mix up carat weights of single diamonds with total diamond weights - the mean very different things and mixing them up can trick you when you're considering different prices.
A large diamond which has a huge crack down the middle, or alternatively a big yucky looking inclusion, is not a good look - it looks like someone has gone for size and sacrificed all the other desirable properties of the diamond. Clarity, for example, can be just as important in picking a diamond.