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The EightStar Pattern
The EightStar pattern proves the exquisite craftsmanship of the diamond.
The pattern appears because the faceting is so precise. The rays of the star reflect the eight "main" facets on both the crown and the pavilion. These facets form the star because they are proportioned in exact relation to one another.
Seen in the Firescope, the star is black because it is reflected from the eyepiece over the diamond. The rest of the field is red because it is reflecting light from the filters of the eyepiece - and shows no light leakage.
Look more closely at the red field and you'll see symmetrical light-pink motifs shaped like flower petals and teardrops. Just as the star indicates that the main facets are performing in balance, these motifs indicate that the diamond's other facet groups are in balance, too.
These patterns also reveal another quality of superior light return: contrast brilliance. The surface of the diamond would look like a headlight if it were to only return an even glare of light. But the EightStar "pops" and "snaps" because there is such sharp contrast between the facets. They keep the light separate, so can you see the brilliance distinctly.
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