Diamond Crown height
The steeply rising prices for rough goods on the diamond market has undoubtedly led to the tendency, clearly observable over the last few years, ...
Crown Height Percentage
The crown height expressed as a percentage of the average girdle diameter.
Crystal ...
Crown Height The height or depth of the top part of a diamond, above the girdle.
Crystal A diamond is a large single crystal of carbon.
Crown Height
The Crown Height is the height of the Crown from the Girdle to the top of the Table.
Pavilion Angle ...
Crown Height
The height or depth of the crown of a diamond, above the girdle.
Crystal ...
Crown Height: A measurement of the distance from the girdle to the table on a diamond or other cut stone.
Crown height - A measurement in proportion to the pavilion depth. One must be judged against the other to determine proper symmetry.
Crown Height: Is the measurement from the girdle to the table on a diamond or gemstone.
1. Table size
2. Crown height and angle (angle of the bezel facets with the girdle)
3. Pavilion depth and angle (angle of the pavilion facets with the girdle)
4. Girdle thickness
5. Culet size ...
Crown HeightThe distance from the girdle to the table on a diamond when viewed from the side. CrownThe upper part of a diamond above the girdle. CrystalA glass stone or bead, usually with high lead content.
Variations on the Tolkowsky Brilliant (diagram below) are the "Eppler" (European Practical Fine Cut, or Feinschliff der Praxis) with a table width of 56%, crown height of 14.4%, and overall height of 57.7%. The "Scan D.N.
Respective of the girdle diameter, the crown height is 14.4%, the pavilion depth is 43.2%, the table diameter is 56.0%, and the crown height to pavilion depth ratio is 1: 3.00. The crown angle is 33.2 degree and the pavilion angle is 40.8 degrees.
Pavilion depth: Along with crown height, pavilion depth determines the overall proportion and symmetry of a gemstone cut.
Pear-shaped: A pearl that grows round on one end and tapers to a smaller top. Also a cut shape for gemstones.
Spread stone: A Diamond with a large table and a thin crown height.
Surface Graining: Surface indication of structural irregularity. May resemble faint facet junction lines, or cause a grooved or wavy surface, often cross facet junctions.
A diamond that comes with a large table and thin crown height.
Star facet
Facet found on the upper crown section of brilliant cut diamonds next to the table. One of the eight triangular facets.
Generally, when the crown height is too low, the gem lacks sparkle. Shallow pavilions create windows, while overly deep pavilions create extinction. Again, proportions often are dictated by the shape of the rough material.
25 carat or larger size, crown heights 12 to 15 %, thin to slightly thick girdles that are clean, pavilion depth of 42 to 44%, modern cuts only, SI1 or better clarities, and none or faint blue fluorescence is acceptable.
Rectangular shaped diamonds like the radiant cut differ from circles, like round diamonds. A circle is symmetrical but a rectangle is not. In round diamonds, depth percentage, crown height and pavilion depth are measured relative to the diameter of ...
cut grades and a different set of parameters for their top cut grades, usually Excellent, Ideal or AGS0, the best way to compare a diamonds cut grade is by the individual proportions listed on the diamond certificate - Table%, Depth%, Crown Height, ...
The cuts are typically oval to cushion shaped with windows, low crowns and bellied pavilions. The "make" (proportions and finish) is "inferior" in that the table sizes, crown heights, pavilion depths, ...
 See also: Crown, Diamond, Facet, Culet, Table
  
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