Deciphering SI1 and SI2 Diamond Clarity

When buying a diamond, clarity is of utmost significance. Although there are various tier grades for clarity, SI1 (Slightly Included 1), and SI2 (Slightly Included 2) would be the most sought after for the value they offer. But what do these two grades portray and how do they change the appearance and value of the diamond? Let’s dive deeper to understand this better.

What is Diamond Clarity?

Clarity embodies diagrams inclusions (internal parts of a diamond that are usually thought to be a negative attribute) and Blemishes (dirt or other marks on a surface deemed to be unsightly). The fewer the number of inclusions a diamond has, the clearer it is and it automatically adds up its value. The GIA (Gemological Institute of America) has its own scale that defines clarity from Flawless as the most valued to Included as the least I1, I2, I3. 

SI1 and SI2 are in the category of “Slightly Included”, which includes having inclusions detectable under 10x magnification but not by human eyes. 

What is SI1 Clarity?

SI1 diamonds have some inclusions, that are impossible to locate with a naked eye but once a diamond is examined thoroughly, these inclusions can be discovered. 

SI1 inclusions include small crystals, feathers, clouds but are strategically placed in parts of the diamond that do not interfere with the brilliance of a diamond.

Diamonds with SI1 clarity are considered relatively eye-clean, making them a great value compared to lower clarity grades such as VS1 or VS2.

What is SI2 Clarity?  

While SI2 diamonds possess inclusions more prominent than SI1, some inclusions may be visible without the aid of a microscope. This is entirely dependent on the size, type, and location of the inclusions.  

The inclusions may come in the form of black blemishes, white clouds, or small fissures, and if they are too large or centrally located, they can hamper the diamond’s sparkle.  

These diamonds provide a good bang for your buck, but it is best to inspect them closely before purchase.    

SI2 diamonds have significant cost savings, but it is important to examine them carefully prior to purchase.  

SI1 vs. SI2: Which is Better?  

The degree to which one can see the inclusions: SI1 diamonds will be more eye-clean, so they won’t have noticeable inclusions, while SI2 diamonds run the risk of displaying visible flaws.  

Price Gap: SI2 diamonds cater to cost-conscious buyers far better than SI1 thanks to their lower cost. However, it is wiser to buy them if one prioritizes size over clarity.  

Brilliance & Sparkle: SI1 diamonds, on average, possess better brilliance because the inclusions in them are smaller and less obstructive.  

How to Choose Between SI1 and  SI2 Diamonds  

Visit the diamond in person or request an HD image: Certain SI2 diamonds can look eye-clean in particular shapes and settings, but others may not.

Select An Ideal Cut: A diamond which is perfectly cut can hide some inclusions and improves the diamond's overall beauty.

Select Certain Shapes: Round, princess, and cushion cuts are better to conceal inclusions than step cuts such as emerald or Asscher cuts.

Mind The Setting: Inclusions in SI2 diamonds can be masked by bezel and halo setting type of mountings.

Conclusion

For buyers who want a good mid-range in price and diamond's visual quality, clarity SI1 and SI2 are perfect for to consider. An SI1 diamond is ideal if you seek an eye clean look at a lower price, but for those who want to get the most weight for their budget, a carefully selected SI2 diamond is a great choice. Make sure that you always check the clarity characteristics before buying in order to get the best diamond for your needs!