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Weight Loss Example for a Flat Euro
As you can see the modern proportions overlay an old European cut. You can see the huge weight loss in blue and black due to the lack of knowledge by the earlier cutters of proper angles.
Judging from the Table Reflection Method, the pavilion on this chipped Euro is close to acceptable angles. 15% weight loss is likely to achieve a modern cut.
Our example is a Euro with very flat pavilion angles and a very heavy crown. The crown has 40° angles and a 48% table. Measurements: 10.06 x 9.45 x 4.25 mm. The diameter is irrelevant since the problem will be depth. Take the depth measurement (4.25 mm) and divide it by the desired depth percentage. This is where you have to be very careful. Since the crown angles are so high and the table is so small, once the cutter has reduced these crown angles, the table will even be smaller. In fact the first thing the cutter will do is to open up the table on his scaife, so that he has a flat area to work from. Remember, the cutter uses the table to measure crown and pavilion angles. Once the cutter has his final angles, which will be 34.5° (the highest acceptable angle), the table will shrink further. That forces the cutter to open it up to the smallest acceptable size (53%), which will make the depth percentage shallower at the same time.
