Slightly Included Diamonds

A diamond's clarity grade is determined by any imperfections on the surface or within the stone. Diamonds with a slightly included SI1 or SI2 grade feature inclusions that are noticeable at 10x magnification. This clarity often provides the best value, which is why we suggest starting your search with slightly included diamonds that are eye-clean—meaning that without magnification, you won’t notice anything but sparkle and shine. Shop our full selection of slightly included diamonds to find a unique beauty for your custom piece.


24 of 130,233 Slightly Included Diamonds

FAQs about Slightly Included Diamonds

Inclusions are a diamond clarity term that refers to internal imperfections or natural characteristics in a diamond. Because diamonds are natural stone, no two are alike, and most feature some level of surface blemish or internal inclusion. Only IF and F clarity diamonds are considered truly "flawless."

A slightly included (SI) diamond features inclusions visible under 10x magnification. The 360-degree views we offer are provided at 20x magnification, which is twice the magnification of a jeweler's loop. Under this magnification, you may notice a slight inclusion with even an IF clarity that would be imperceptible otherwise.

An SI1 clarity grade is often considered eye-clean, which means it's difficult to see any blemishes without magnification. SI2 diamonds are a slightly less expensive grade, sometimes featuring inclusions that can be seen with the eye from certain angles. The shape of the diamond helps conceal inclusions as well. Round cuts can hide blemishes that would be visible in an emerald or asscher shape.

There are five key factors that determine a diamond's clarity grade, including the size, number, position, nature, and colour or relief of the characteristics.

Top Slightly Included Diamond Reviews

Slightly Included Diamond Review

Better than all the other options

I looked at James Allen and the LA jewellery district and Blue Nile was the best. Compared to James Allen, it seemed like Blue Nile had better prices and it was easier to really get a good look at the diamond I was buying. The 360 degree video makes a HUGE difference. I was a little nervous about getting an SI1 diamond. I wasn’t confident I could identify the inclusion online. I thought when it arrived in the mail it’d be clear. Nope! My fears were relieved! Online and in person matched up! No clear inclusion (at least not to the naked / untrained eye). I showed it to a diamond expert friend and she couldn’t see it either! What you see is what you get! And at a great price!
Steven W. - Verified Buyer
Average Customer Rating $5 out of 5 stars
Six-Claw Low Dome Comfort Fit Solitaire Engagement Ring
Platinum (2mm)


Slightly Included Diamond Earring Review


My husband bought me a pre setting but then I return it because it doesn’t have GIA and it’s not shiny at all. Then I pick my own diamonds with triple excellent, Si2 with I colour. Price is great with 0.9 instead of 1ct. I save about 2000$ and it’s a lot better in quality. I recommend to pair with 3 prongs martini setting. Your rocks will be more shiny.
Sakuntala W. - Verified Buyer
Average Customer Rating $5 out of 5 stars
Three-Claw Martini Earrings


Slightly Included Marquise Cut Diamond Review

Happy with my engagement ring

Very happy with my engagement ring purchase from blue Nile , it is a beautiful ring and my fiance loves it !
Jackson H.
Average Customer Rating $5 out of 5 stars
Petite Solitaire Engagement Ring
14k Rose Gold



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