THE IDEAL CUT
|Certain modern round brilliant cut diamonds are cut to within certain tolerances that allow them to be referred to as 'ideal' cut.
Why is reference made to the ideal cut when judging the proportions of a round brilliant cut diamond?
The reason is that it displays the most suitable balanced display of brilliancy and fire, and it is the styled of modern brilliant cutting that retains the least weight from the average rough diamond.
'Fire' refers to the flashes of the different spectrum colors seen in diamonds as a result of the diamond separating white light into the spectrum colors as the light leaves the angled crown facets after being totally internally reflected in the diamond.
'Brilliancy' in the diamond is the amount of light reaching the eye as a result of reflections from the internal surfaces of facets, called total internal reflections, and reflections from the external surfaces of the table and other facets of the diamond.
GIA STANDARDS FOR THE IDEAL CUT
For a diamond to be considered 'ideal' the GIA has set certain standards.The above cut guidelines apply for diamonds 0.50cts. and up. For smaller sizes slightly larger tables up to 62% are acceptable.Depth: 58.3 to 62.9% Table Size 53 to 60% Girdle: Medium to slightly thick Pavilion Depth: 43% Polish: Good to Excellent Symmetry: Good to Excellent Culet: none to medium
AGS STANDARDS FOR THE IDEAL CUT
The AGS considers the following proportion parameters when determining whether or not a diamond falls into the 'ideal proportions'.Both the GIA and the AGS have similar grading standards. There are other cut classifications such as 'very good' or 'good' and the diamond HAS JUST AS MUCH BRILLIANCE as an ideal cut diamond. Call 1-800-252-1476 so I can obtain the best cut diamond at the absolute lowest rockbottom price. I will not compromise on the cut at all. Yes, there are certain distinguishing characteristics that IDEAL cuts have. Firstly, on an 'ideal cut' if you look directly down and straight into the table of the diamond with a 10X loupe you will notice a certain phenomenon. Focus towards the bottom point of the diamond (the culet) and you should notice a small octagonal formation around the culet. This is the table reflection that is produced by the 'ideal cut'. It should cover about 1/3 of the table diameter. You will notice that effect in the following 2 ideal cut diamonds displayed below. With ideal cuts, you will notice a bowing in of the facet lines as illustrated in the following sketch. If you look at the sketch and then compare to the actual photos you will then see the effect very clearly.Table diameter: 53% - 57.5% Girdle: Thin, medium, slightly thick Pavilion Depth: 42.5%-43.5% Culet: Pointed, very small, small, medium