How To Correct Faceting Mistakes

faceting mistakes - tourmaline
Tourmaline with chipped culet.

We faceters all like to take pride in our work. However, no matter our skill level, we all make errors. However, you can learn a few tricks for correcting faceting mistakes. These will save you considerable effort. Furthermore, they might even lead to new designs and a better understanding of gem optics.

Missed Index

One of the most common faceting mistakes we make is not setting the index correctly on our faceting machines. If you miss it by just one notch, it’s enough to throw off the entire design.

Here’s the diagram for a meetpoint oval being cut with a 64 index gear. You should cut the shaded facet at 44.7° and I 7, (followed by I 25, 39, and 57.)

correcting faceting mistakes – meetpoint oval

Now, say you make a mistake and cut it at I 8. If so, you should cut symmetrical facets all the way around, …

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