Round diamonds with ideal cut grade have the most brilliance when the weight of the diamond is proportional. It means that the top and bottom parts of the stone are very close to the same weight. And with this balance, the facets can be aligned (cut) to reflect the light perfectly coming in right back up the top part of the diamond giving a fiery or sparkling look. Such factors which contribute to the proportions are girdle diameter, table diameter, total depth, crown height, thickness of the girdle, pavilion depth, angle of the crown facets to the plane of the girdle, and angle of the pavilion facets to the plane of the girdle. The more the diamond cutter deviates from the mathematically correct proportions, the more the brilliance is compromised, and in effect the lower the quality of the cut. But a slight deviation from standard does not bring any loss of brilliance in a diamond.
Buying a diamond requires familiarity on the diamond cut grade. Getting a beautiful round diamond with an ideal cut grade to a very good cut grade is far more important than any other characteristics of the diamond grading process. Diamond certificates for round shape diamonds should give high regard on the cut grade.
When is fluorescence significant in a diamond?
A diamond is not merely valued for its 4 C’s (Carat, Clarity, Color and Cut) but also the presence of fluorescence. Fluorescence is how a diamond responds when exposed to ultra-violet light as its exposure can show colors such as glow of blue, white, yellow, green or even red.
Shortwave UV light is ON
From left to right, where the first diamond shows Very Strong or Extreme Fluorescence that brings out a very bright glow effect. The second diamond having a Strong or Distinct Fluorescence which gives a bright glow look. Third one has a Medium or Moderate Fluorescence thus easily noticeable glow. And the forth diamond with Faint or Slight Fluorescence showing barely noticeable glow.
Shortwave UV light is OFF
If you are planning to get a diamond with the color range between H to J then consider a Medium Blue Fluorescence for this will make your stone look slightly whiter. But if you prefer to buy a diamond with a G or higher color then experts suggest to find a diamond with either No Fluorescence or Faint Fluorescence.
Most diamond certifications like GIA or EGL show the fluorescent grading of the diamond as inferior yet an expert would say that strong or very strong blue fluorescent diamonds usually appear brighter. Medium blue fluorescent diamonds are rarely to appear hazy and slight or faint blue fluorescent ones usually never appear hazy. As a matter of fact, diamond’s fluorescence usually improves the appearance of color in the stone. It makes the stone looks more colorless without any negative effects. Again, diamonds with strong or very strong fluorescence appeared to have a better color than less fluorescent stone and the effect was more noticeable in I to K colors.
Therefore, if you decide to purchase a diamond at a limited budget then take big consideration of the color versus the fluorescence so you can pick the best looking diamond for the woman you love without straining yourself financially.