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).

$660 Gets You This 0.40 Carat G Color SI1 Clarity Ideal Cut Round Cut Diamond

Remembering that the photo is quite magnified, slowly examine it to try and find any big inclusions or defects which are often present in SI1 clarity diamonds.

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An untrained eye won't see the color in this G color diamond, except if the stone is compared side by side with a diamond with say a D color rating (for multistone rings this is important). For any diamond, a price of $660 puts it amongst the lowest price group of diamonds, especially for engagement rings.

A diamond with no girdle is called a knife-edge girdle diamond; this lack of a girdle alters the shape of the diamond. Many different companies will offer an Ideal cut diamond cut grading, and these diamonds are usually (as is the situation here) perfect in terms of proportions and the general shape. Put this 0.40 carat size in perspective as you consider your purchasing options - there are going to be other diamonds of about the same size which might offer more with regards to their cost and properties.

The SI clarity group of diamonds (which this SI1 clarity diamond is part of) is the place where bargains are found. Look for a diamond that appears "clean" to the naked eye, either by going over the diamond in the flesh, or by checking out an online enlarged photo showing the stone.

Shape: Round

Carat weight: 0.4

Cut: Ideal

Color: G

Clarity: SI1

Price: $660

Certificate: GIA

Depth: 62.3%

Table: 57.0%

Polish: Excellent

Symmetry: Excellent



Fluorescence: None

Measurements: 4.70*4.74*2.94

Item number: 1346105

Click here to search for other diamonds at James Allen.