GemCad Derived Rendering by Bob Keller

SRB Variation with Doubled Mains and Stars | |
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Angles for R.I. = 1.54 | 81 facets + 16 facets on girdle = 97 |

16-fold, mirror-image symmetry | 96 index |

L/W = 1.000 T/W = 0.618 T/L = 0.618 P/W = 0.442 C/W = 0.134 | H/W = (P+C)/W+0.02 = 0.596 P/H = 0.742 C/H = 0.224 |

Vol./W^3 = 0.197 | Brightness at 0 degrees tilt for R.I. = 1.54
COS = 64.4% ISO = 68.1% |

Pavilion | |||
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pb | 42.50 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Cut to temporary center point |

g | 90.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Cut to meet pb |

pm | 41.50 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Cut to meet pb,g |

Crown | |||

cb | 38.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Cut to meet g - level girdle |

cm | 35.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Cut to meet cb,g |

s | 27.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Cut to meet cb,cm |

t | 0.00 | Table | Cut to meet s,cm |

This variation of the SRB doubles the number of main and star facets in each course. Note that in this variation the symmetry increases from 8 fold to 16 fold - there are 16 each pavilion main, pavilion break, girdle, crown break, crown main and star facets. Increasing the number of facets increases the scintillation and is a way of scaling up the SRB to work with larger stones. |