Ikeda - Tourm One By Two
From The Gemology Project
Tourm One By Two - Hideki Ikeda
This design is good for the RI 1.62 and higher. It is excellent for tourmaline crystals with high recovery.
There is no surprise in cutting. However, there are a few areas for a faceter to pay more attention. They are (1) the four crown corners where the facets B, C, D and E meet, (2) the facet J which cuts very quickly and (3) the shallow cutting angles of The facets F and I.
If there is more material above the girdle, the crown can be safely raised by 10% by tangent ratio. In the picture of the pale blue green tourmaline, the crown has been raised by 10%.
Click on this link to download the gemcad file: File:Tourm1x2.gem
Click on this link to download the pdf file: File:Tourm1x2.pdf
