Diamond clarity grades often spark debate, particularly when you examine the lower end of the spectrum. One particularly contentious grade? SI, or slightly included diamonds. Let’s delve into the distinctions between SI2 and SI1 clarity grades to help you determine if they might be suitable choices for your diamond engagement ring.
SI2 vs SI1: What’s the Difference?
Both SI2 and SI1 clarity diamonds feature inclusions that may be visible to the naked eye — varying in size and located either at the center or near the girdle. The primary differences between SI2 and SI1 diamonds lie in the number and type of inclusions present.
SI1 diamonds generally have fewer inclusions compared to SI2 diamonds. The inclusions in SI1 diamonds can be minimal — from a single inclusion to several in the same stone — and they tend to be smaller. These inclusions can include crystals, feathers, knots, needles, cavities, chips, clouds, twinning wisps, or indented naturals. (Curious about these terms? Our guide to diamond inclusions provides detailed explanations and examples.)
Conversely, SI2 diamonds contain more inclusions of the same types, and these inclusions are usually larger.
When it comes to appearance, the difference between SI2 and SI1 diamonds can be subtle. One might look slightly foggier or less perfect compared to the other, but most casual observers would not be able to discern any difference in brilliance between the two.
SI2 vs SI1: How Their Prices Stack Up
One of the biggest advantages of SI diamonds is their affordability. SI1 diamonds are just a grade below VS2 (Very Slightly Included 2) diamonds, sharing many similarities but sporting markedly different price tags. Opting for an SI diamond can result in savings of 10 to 20 percent over a VS diamond.
There is also a price difference between SI2 and SI1 diamonds, but this varies depending on the specific stone.
Are SI Diamonds a Good Choice? The Bottom Line
SI clarity diamonds should be evaluated individually when considering them for a diamond engagement ring. While we’ve encountered stunning SI diamonds, we’ve also advised against certain SI diamonds that were not ideal for brilliance.
If you decide to invest in an SI diamond, working with a gemologist is recommended. They can help you find the best stone with minimal inclusions and suggest a setting that highlights the stone’s beauty while masking any imperfections.
Interested in an SI diamond but unsure where to begin? Fill out the short form below, and our experts will provide three personalized diamond suggestions that match your preferences and budget. If you like a suggestion, great! We’ll continue the conversation from there. If none of the options suit you, let us know. Our experts are committed to finding the perfect fit for you and will keep searching until they do.
FAQs
Is SI2 a good diamond?
An SI2 diamond can be a worthwhile purchase if it is eye-clean. SI2 clarity diamonds have noticeable inclusions visible at 10x magnification. Occasionally, the inclusions — such as feathers, chips, and clouds — are prominent enough to be seen with the naked eye.
However, there are select SI2 diamonds that can look stunning and offer significant cost savings. Consequently, working with a gemologist to find the best stone with minimal inclusions is advisable.
What is the best shape to cover SI2 inclusions?
The ideal shape to cover SI2 inclusions depends on the size and location of the inclusions. Generally, round or cushion cut diamonds, which have larger surface areas, may mask inclusions more effectively compared to elongated shapes like marquise or pear cuts. Examining the diamond physically or through high-resolution images is always recommended for making an informed decision.
What are the common inclusions in a SI2 diamond?
Common inclusions in an SI2 diamond include crystals, feathers, knots, needles, cavities, chips, clouds, and twinning wisps.
Is SI1 a good diamond?
SI1, or “slightly included 1,” indicates diamonds with inclusions visible under 10x magnification. SI1 diamonds may have inclusions visible to the naked eye, but these typically do not significantly affect the diamond’s appearance. They are generally less expensive than higher clarity grades like VVS or Flawless yet can still be beautiful and offer good value. Ultimately, the suitability of a diamond depends on individual preferences and budget.
What are the common inclusions in an SI1 diamond?
The inclusions in SI1 diamonds are usually small and do not significantly affect the diamond’s overall appearance. Common inclusions in SI1 diamonds include:
- Crystals: Tiny mineral crystals trapped within the diamond, appearing as dots, lines, or clouds in various colors.
- Feathers: Small fractures in the diamond’s crystal structure, resembling thin, wispy lines.
- Knots: Small crystals on the diamond’s surface, visible from the front.
- Pinpoints: Tiny, single or clustered dots in various colors.
- Bearding: Thin, curved lines within the diamond.
- Needles: Thin, elongated crystals growing within the diamond.
