Online Faceting Designs & Diagrams: Rainbow


Rainbow by Jeff R. Graham

Rose Malaya Garnet "Rainbow"

Rainbow – Cutting Remarks

Shown at left is a 13.1mm x 17.8mm x 10.5mm deep ~ 18.53 carat Rainbow cut from flawless Rose Malaya Garnet by Jeff Graham.

This is an updated version of my original “Rainbow” design.

The original “Rainbow” has always been a very popular cut with people. But it can be difficult to cut, particularly for an inexperienced cutter. It is the design I hear from people that they have the most trouble with.

So I decided to re-work the original and make it better and easier to cut for low milage cutter. This design is still not easy and I do not especially recommend it for a new cutter. But it’s definitely easier than the original.

This version is better performing in lower refractive index materials and I particularly set it up for 1.62, Tourmaline and Topaz. Cut in refractive indexes 1.62 to 2.14 with no changes. For Quartz add .3 degrees to all the pavilion tiers (40.5 degrees).

It is very easy to end up with the wrong L/W on Omni point barions so a preform of the correct L/W is always helpful.

Note: If your breaks look like the rocky Mountains, check your L/W, it is probably off one way or another.

I bought this Garnet as a native cut and it was really awful… I needed to design something that would give me a decent weight return and still get some life into this huge red Garnet. I decided that I needed a brilliant Pavilion, even if the rough loss was going to be higher and it sure was.

Enjoy cutting your “Rainbow”… Drop me an email to let me know your results and what you’ve cut, or feel free to inquire if you have any questions or need some help regarding this design.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.