Diamond clarity, evaluated on a scale from FL (flawless) to I (included), is assessed at 10x magnification to detect tiny imperfections called inclusions. When inclusions are apparent, they are graded as SI or slightly included. SI occupies a mid-position on the clarity scale.
What Does SI Mean in Diamonds?
SI denotes small inclusions visible at 10x magnification in a diamond. They might be seen without magnification, especially if they are larger or centrally located, where facets don’t obscure them.
The SI category includes SI1 and SI2 (slightly included 1 and slightly included 2). SI1 diamonds exhibit fewer, smaller, and less noticeable inclusions compared to SI2. The inclusions are typically medium in size and can appear anywhere on the diamond, often more centered. SI diamonds generally have centered inclusions. The inclusions in SI2 and SI1 can vary, ranging from a single inclusion to several. Typically, expect one primary grade-setting inclusion rather than multiple smaller ones.
diamond clarity” />Common SI1 Inclusions are:
- Cavity
- Chip
- Clouds
- Crystal (white or black)
- Feather
- Indented Natural
- Knot
- Needle
- Twinning Wisps
As SI diamonds are below the VS2 grade (very slightly included 2), they provide great value for budget-conscious buyers. Less than 50% of the world’s gem-quality diamonds fall into this range. An SI diamond can be 10% to 20% cheaper than a VS diamond. SI1 diamonds, in particular, are in high demand because their inclusions are not outwardly noticeable, allowing consumers to focus on optimizing other C’s like color and carat.
Clarity stands as one of the four primary C’s of diamond buying, alongside cut, color, and carat.
Watch our founder’s video to learn how to balance the 4 C’s for the best diamond within your budget.
SI2 vs SI1: How Different are They?
Both SI2 and SI1 diamonds contain inclusions that you may notice with the naked eye — some larger, some smaller — located either at the center or near the girdle of the stone. The primary differences between SI2 and SI1 diamonds lie in the number and type of inclusions. Learn more about SI2 vs. SI1 Diamonds.
Is an SI1 Diamond Good?
Absolutely! While an SI1 diamond isn’t flawless, both SI grades are beautiful and valuable. Typically, no one will inspect closely enough to detect inclusions. SI diamonds, like most high-quality diamonds, appreciate over time. It’s best to have SI diamonds set by experienced gemologists to ensure optimal appearance.
Popularity of SI Clarity Diamonds
SI diamonds enjoy popularity because even though they might have visible clarity characteristics, they don’t significantly detract from their sparkle. To the naked eye, the diamond’s luster remains high, unless large inclusions or clouds are present. Structurally, SI diamonds are generally not prone to chips or cracks when set in jewelry, even with inclusions near the girdle.
Over time, consumer preference has leaned towards diamond quality over sheer carat weight. It’s generally recommended not to go below SI in clarity, especially for larger diamonds, as imperfections become more evident. For smaller diamonds (below 0.50ct), SI inclusions are typically not eye-visible.
Searching for an SI Diamond
SI quality diamonds can be purchased from various jewelers, though the quality of SI diamonds may vary based on the jeweler’s inventory.
Using Artful Bracelets‘ diamond search tool, you can access a vast inventory of diamonds with SI1 and SI2 clarity at the right price. Match the clarity with the other diamond 4C’s to determine if SI suits your budget and preferences. Clarity’s significance ultimately hinges on your personal taste.
The clarity range below SI is I (included), signifying:
- Obvious inclusions or imperfections visible under 10x magnification.
- In inclusions that might be apparent without magnification in diamonds larger than 0.5 ct.
Lab Grown SI1 Diamonds
Whether natural or lab-grown, all diamonds possess some inclusions, making each diamond unique.
It’s a common misconception that lab-grown diamonds are flawless. Despite being created in controlled environments, lab-grown diamonds also develop inclusions, whether through HPHT (High-Pressure High Temperature) or CVD (Chemical Vapor Deposition) processes. Natural diamonds also contain inclusions, although often not visible to the naked eye, making SI clarity diamonds popular today. SI stands for Slightly Included, indicating inclusions visible only under 10x magnification.
Both lab-grown and natural SI clarity diamonds look similar, differing only in their origin. Natural diamonds are mined, while lab-grown diamonds are created in laboratories. Both types are graded similarly on clarity scales by gemologists. While our natural SI-grade diamonds come with a GIA certificate, lab-grown SI clarity diamonds include an IGI certificate.
At Artful Bracelets, we certify all our diamonds to provide buyers peace of mind.
Although SI clarity diamonds have inclusions, they offer great value. Such diamonds are usually ‘eye clean.’ However, if a diamond isn’t ‘eye clean,’ check for clouds, feathers, and crystals to see if they affect your choice. For example, a round-shaped, H color, SI clarity, and 1-carat-sized natural diamond might cost around $4500, while the same lab-grown variant would be about $1500.
Working with a gemologist ensures you get the right value and quality.
Working with an Expert is Always a Good Way to Go
When investing in SI diamonds, a gemologist can help you select the best stone with minimal inclusions. They can also recommend diamond engagement ring settings that mask inclusions, enhancing the stone’s beauty.
Interested in SI diamonds but unsure where to begin? Fill out the short form below. Our experts will provide three personalized diamond suggestions that match your taste and budget. Like one? Great! Let’s discuss further. None fit? Share your feedback. Our experts won’t rest until you find your perfect diamond.
