Seattle Facetor Design Newsletters

Robert H. Long and Norman W. Steele were pioneers in the development of mathematical methods of designing faceted stones. One of the best teaching tools is still their book “Introduction to Meetpoint Faceting”. From 1967 to 1997, they published a newsletter called “Seattle Facetor Design”. These writing are historically important, and still useful today.

Bob Long has generously scanned his copies of these newsletters and given the USFG permission to place them on their website. USFG member Bob Lawrence has contributed time and effort to convert the scanned files to PDF format.

1997

Page 2 – July 1997

1995

About Preforms – January 1995

1993

Progress on Gemcad Upgrade – June 1993

1992

Problems of Drawing Interpretation – September 1992

Preform PF07090 – June 1992

Preforms for Square Emerald Cuts – April 1992

1991

ECED Facet Design – August 1991

Keyed Dops – Problems and Solutions – May 1991

Locating True Centerpoint – March 1991

Discussion of Cam-Easy Faceting – February 1991

Spot Brightness Diagrams for SRB Design – January 1991

1990

Brightness – December 1990

Hits on Unpolished Girdle – November 1990

Waytrace Functions in Gemcad – September 1990

Brightness Contour Plot for Corundum Extended Low Range – June 1989

Cam Preform Problem – May 1990

1989

Nobands – December 1989

Brilliance in Tilt – December 1989

Brilliance in Tilt 2 – December 1989

Cut-Corner Rectangle Design Problem – December 1989

Brightness vs Crown Angle – August 1989

Effects of Table Size in a SRB Design – August 1989

Pavilion Angle Limits – July 1989

Page 2 – July 1989

Apex Octagon – May 1989

Page 1 – May 1989

Page 2 – May 1989

Page 3 – May 1989

Brightness Plots To Determine Conditions for Bright Gems – March 1989

Brightness Plots to Determine Conditions for Bright Gems – April 19

Brightness Plots to Determine Conditions for Bright Gems 2 – April 1989

Page 2 – March 1989

1988

Brightness Plots for Design Variations (London Shield) – October 1988

Discussion of Brightness Plots – October 1988

13.022a London Shield Variations 2 – October 1988

Hope Diamond Replica – June 1988

Ray Tracing Experiment – April 1988

Ray Trace Experiment – March 1988

Design Considerations for Design 1.373 JFG #3 – January 1988

Design Considerations for Design 1.232 JFG #3 – January 1988

1987

Finding Angles for Optimal Brilliance – November 1987

Page 2 – November 1987

Page 3 – November 1987

Page 4 – November 1987

The Mini Barion Series – July 1987

Page 2 – July 1987

Felt Tip Polishing – May 1987

Polishing continued – May 1987

1986

Diamond Facet Progress 1 – August 1986

Diamond Facet Progress 2 – August 1986

Page 3 – August 1986

Page 4 – August 1986

Page 2 – July 1986

Page 3 – July 1986

1985

Tangent Ration Conversion Nomogram – February 1985

1982

Locator Facet Method – June 1982

1981

Page 5 – December 1981

1980

Calibrating a Cheater – October 1980

Emerald Preforms – March 1980

ECED regular Polygon Preforms – March 1980

1979

Corregenda – June 1979

Cubic Zirconia – January 1979

Comparison of Exact Method of Angle Translation – January 1979

Angle Translation Error – January 1979

Angle Translation Error 2 – January 1979

1978

Standard Brilliant Cut – December 1978

Standard Brilliant Crown Table – December 1978

Standard Brilliant Crown Table 2 – December 1978

Page 5 – December 1978

Page 6 – December 1978

Page 7 – December 1978

Page 8 – December 1978

Note on Tangent Ration Facet Angle Translation page 5 – November 1978

Page 6 – November 1978

Standard Brilliant – October 1978

Page 2 – August 1978

Page 1 – April 1978

Meet Point – March 1978

1976

Preforming Chart for True Ellipse – February 1976

Preforming by Centerpoint Angle Method – February 1976

Preforming by Centerpoint Angle Method 2 – February 1976

12 MainTrue Ellipse – February 1976

Cutting Angles for 12 MainTrue Ellipse – February 1976

Facet Troubleshooting Guidedate unknown

1975

True Ellipse 1 – June 1975

True Ellipse 2 – June 1975

True Ellipse 3 – June 1975

True Ellipse 4 – June 1975

True Ellipse 5 – June 1975

Pavillion Angles for 12 Main Ellipse 72 Index – June 1975

Pavillion Angles for 8 Main Ellipse 96 Index – June 1975

1968

Tables for Calculating Off-Set Head Settings for Ovals – October 1968

Recreate Fancy Shaped Stones Without Having to Revise the Angle – September 1968

1967

Design 29-2 – October 1967

Problems of Drawing Interpretation.

Seattle Facetor Design – September 1992


Waytrace Function in Gemcad

Seattle Facetor Design – September 1990


Brightness Plots for Design 13.022 Variations (London Shield)

Seattle Facetor Design – October 1988 Part 1


Discussion of Brightness Plots for Design

Seattle Facetor Design – October 1988 Part 2


October 1988 13-022A London Shield Variation 2

Seattle Facetor Design – October 1988 Part 3


Recreate Fancy Stones Without Having to Revise the Angles

Seattle Facetor Design – September 1968