Interesting facts about SI diamonds

by Kristen

Have you ever come across an SI diamond?  Do you know what this diamond is? If your answer to these questions is no, know that you are not alone. Many people would take an SI diamond for a flawless diamond without any idea of the difference. However, if you want to learn, then you are at the right place.

si diamonds are beautiful and can pass for flawless diamonds if not properly checked. They are real diamonds, but they have fillings at the center. Simple facts about this treasure will help you understand it better. The diamond can pass the pen checker test too like other diamonds.

If you continue reading this article, you will learn amazing facts about SI diamonds that you probably didn’t know about. So, keep reading if you want to learn.

What are SI diamonds?

The full meaning of SI diamonds is, “Slightly Included diamonds”. This means this grade of the precious stone is not entirely diamond. There is inclusion at the center of the precious stone you can hardly notice without a 10x magnification. But, some people who have worked with diamonds for a long time can notice the inclusion, even without the 10xmagnification. The reflection of inclusion will be noticeable and diamond experts can spot it.

Interesting facts about SI diamonds

There are facts about the SI grade of this precious stone that will interest you and there are:

SI diamonds are mostly real diamonds

The fact that this precious stone has an inclusion in it doesn’t make it unreal. It will pass every diamond test and even the famous pen checker test. Many other precious stones will pass some of these tests not because they are real but because a component they have makes it possible. But, that is not the same with SI diamonds.

SI diamonds are valuable

You might think the slightly included treasure is not valuable because of the inclusion. The good news is that it is valuable, even more than a few other precious stones. An SI diamond costs about $4,000 to 6,000, depending on how big it is. This goes a long way to show how valuable this treasure is, although it is not entirely a diamond.

SI diamonds have two types

It might interest you to know that there are two types of SI diamonds. They are the SI1 and SI2 diamonds, but they have slight differences in looks and value. The SI2 has a bigger inclusion than the SI1 and this makes it less valuable too. For the SI1, you will need a 10x magnification to see the inclusion, but for the SI2, the inclusion is visible.


The SI diamonds are still original and beautiful. In most cases, people mistake it for flawless diamonds because the difference is hardly visible. This precious stone is expensive even if its value cannot get compared to the flawless one. The SI precious stone grade has two different types, and they are SI1 and SI2. The SI1 is more valuable than the SI2 because its inclusion is way lesser.

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