Amethyst
PC 01.216 Rugua
Designed by Steele, Norman W
Craft-heritage reference library — every cut design below is drawn from a historical faceting-design corpus with mixed third-party licensing (designer credits and license notes are shown on each spec sheet). The studio does not own and does not exclusively sell these historical designs. They are shown here for sourcing and educational context — to demonstrate the geometry our verification process can evaluate on any species. Our only studio-owned, exclusively-sold designs are Dragon Eye and Eye of Zul, under Signature Cuts.
Primary pick
PC 01.216 Rugua
Steele, Norman W
- Shape
- Round
- Facets
- 129
- L/W ratio
- 1.00
- Depth ratio
- 0.734
- Table fraction
- 45.5%
- ISO brightness
- 86.7%
- Pavilion margin
- 8.64°
- Gem score
- 0.9200
Portuguese round, or round brilliant with >= 97 facets and 8-fold symmetry, RI 1.53-1.56. Designed for the gem; ISO 86.7 % at n_d 1.5443, pavilion margin 8.6 deg, gem score 0.9200 (rank 26 of all suitable designs). Crown main 46.0 deg / pavilion main 49.0 deg, 129 facets, L/W 1.00, depth/width 0.73, table 0.46.
Design: PC 01.216 Rugua — Steele, Norman W. Craft-heritage reference from the historical faceting-design corpus; not a studio-owned design.
Alternates considered
PC 01.130A Augur CC
Word, SId
- Shape
- Round
- Facets
- 129
- L/W ratio
- 1.00
- Depth ratio
- 0.657
- Table fraction
- 59.9%
- ISO brightness
- 85.3%
- Pavilion margin
- 8.64°
- Gem score
- 0.9116
Portuguese round, or round brilliant with >= 97 facets and 8-fold symmetry, RI 1.53-1.56. Designed for the gem; ISO 85.3 % at n_d 1.5443, pavilion margin 8.6 deg, gem score 0.9116 (rank 37 of all suitable designs). Crown main 46.0 deg / pavilion main 49.0 deg, 129 facets, L/W 1.00, depth/width 0.66, table 0.60.
Design: PC 01.130A Augur CC — Word, SId. Craft-heritage reference from the historical faceting-design corpus; not a studio-owned design.
Étoile de France
Patrick Dubuc
- Shape
- Round
- Facets
- 105
- L/W ratio
- 1.00
- Depth ratio
- 0.659
- Table fraction
- 61.0%
- ISO brightness
- 81.4%
- Pavilion margin
- 4.83°
- Gem score
- 0.8791
Portuguese round, or round brilliant with >= 97 facets and 8-fold symmetry, RI 1.53-1.56. Designed for the gem; ISO 81.4 % at n_d 1.5443, pavilion margin 4.8 deg, gem score 0.8791 (rank 114 of all suitable designs). Crown main 46.24 deg / pavilion main 45.19 deg, 105 facets, L/W 1.00, depth/width 0.66, table 0.61.
Design: Étoile de France — Patrick Dubuc. Craft-heritage reference from the historical faceting-design corpus; not a studio-owned design.
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