As a collector who had purchased a number of different gemstones, I am a total geek when it comes to examining diamonds. In fact, I’ll be the first to admit my fetish for inspecting both rough and polished diamonds under the scope whenever an opportunity presents itself.
Recently, I purchased a batch of rough diamonds for my private study. To my pleasant surprise, I discovered that one of them displayed interesting triangular patterns on its surface and I stumbled upon “pyramids” on a diamond!
Cool looking triangular features.
With the discovery of a feature I had never seen before, it got me elated and very curious. What are these patterns doing there and why do they form? After browsing several resources, I found my answers from a reference book by John I Koivula – “The Mirco World of Diamonds”.
This fascinating triangular shaped feature is called a trigon.
The other side of the same rough.
The growth pattern can sometimes look like a series of triangles within triangles.
As it turns out, trigons are surface features that occur during the diamond’s growth process deep within the Earth’s mantle. They can appear on any shapes of rough diamonds and are a good indicator that the gemstone/rough is a diamond. Most other gemstones or minerals will not exhibit such growth patterns.
For more detailed information, check out this journal paper to see more photographs about trigons and how they form on different crystals.
While they can be a fairly common occurrence on the surfaces of rough diamonds, finding them on your diamond ring is really rare. Since the surface of a rough diamond is polished off to create facets during the cutting process, the trigons get wiped off the face of the diamond.
However, there are a couple of places in which they might still exist on a polished diamond. Take a guess. Where do you think you would be able to see trigons? If you made a logical guess that they will remain on places where the rough diamond is left untouched, you are right.
It is possible that trigons can be found on naturals or indented naturals of a polished diamond. Since the natural/indented natural is left as part of the original rough during the cutting process, that’s where you’ll be able to find them if they exist.
Does your stone have naturals or indented naturals?
If your diamond has indented naturals or naturals, check them for the presence of trigons. But don’t fret if your diamond has them or if it doesn’t show any. It won’t change or affect the current clarity grade or the appearance of your diamond as they are already factored in during the grading process. They do however; serve as an alternate feature to help you identify your stone.
If you do find them, that’s a real bonus! I am sure these little creations of Mother Nature will fascinate you as much as they wowed me. Do take some photographs and share them with me. I would definitely love to see how the trigons on your diamond look like.<< Prev Page