Education

The Table Percentage Bowing Method (5.27)

The Table Percentage Bowing Method can also be effective in table size estimation. With properly cut star facets, a 60% table forms a perfect square.

The Table Percentage Ratio Method (5.26)

The Table Percentage Ratio Method relies on your perception for comparing distances for table size estimation.

Upper Halves Height (5.39)

The idea of the upper girdle facets is again, to provide many additional angles to send light in a combination of many different directions.

Lower Halves Height (5.38)

By not extending the lower halves to at least 75% and sometimes up to 88% (3/4 to 7/8), the center of the diamond is left lacking in brilliance.

The Role of the Upper and Lower Halves (5.37)

These additional 32 facets (halves) reflect the light into a multitude of directions. Without them, only slight brilliance is apparent, since the light is then reflecting in far fewer directions.

Upper and Lower Halves (5.36)

Upper and lower girdle facets (also known as halves), include 32 facets, 16 on top and 16 on bottom, that add additional brilliance to a diamond.