SI1 Diamonds — Certified SI1 Clarity

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Buyer's Guide: SI1 Clarity Diamonds

SI1 is the budget maximizer's clarity grade. For buyers whose primary goal is to get the biggest, most visually impressive diamond possible, SI1 offers remarkable value — often delivering an eye-clean stone at 20-30% less than VS2 and up to 40% less than VS1. The key to buying a great SI1 diamond is knowing which shapes, sizes, and inclusion types to look for, and our guide will show you exactly how to make the most of this value-driven grade.

Which Shapes Hide SI1 Inclusions Best?

Brilliant-cut shapes are your best friend at SI1 clarity. Round brilliant diamonds are the most forgiving — their 57-58 facets create intense light dispersion that effectively masks minor inclusions. Oval, cushion, pear, and princess cuts also perform well at SI1 because their complex faceting breaks up internal reflections. Shapes to approach more carefully at SI1 include emerald and asscher — their large open facets can reveal inclusions that brilliant cuts would hide.

How to Pick a Great SI1 Diamond

Not all SI1 diamonds are created equal. The best SI1 diamonds have inclusions that are light-colored (white crystals or clouds rather than dark spots), positioned off-center or near the girdle (rather than directly under the table), and small relative to the diamond's size. When reviewing a GIA certificate, look at the inclusion plot — if the primary inclusion is marked near the edge of the diagram, there is a good chance it will be hidden by the setting's prongs or bezel. Our experts can help you identify the best SI1 diamonds in our inventory — contact us for personalized assistance.

SI1 for Engagement Rings: A Smart Strategy

Many couples are surprised to learn that SI1 can be an excellent choice for engagement rings, especially in round brilliant and oval shapes. The strategy is straightforward: select a well-cut SI1 with favorable inclusion placement, then invest the clarity savings into a larger carat weight or a premium setting. A beautifully cut 1.50-carat SI1 round brilliant will turn more heads than a 1.00-carat VS1 — the size difference is immediately apparent, while the clarity difference is invisible. Design your own ring to see how far your budget can go.

Diamond Education

Clarity Guide

Understanding Clarity

Frequently Asked Questions

Everything you need to know about SI1 clarity diamonds.

Can an SI1 diamond be eye-clean? +

Yes, many SI1 diamonds are eye-clean — meaning no inclusions are visible to the naked eye. Eye-clean rates vary by shape: approximately 70-80% of round brilliant SI1 diamonds are eye-clean, with similar rates for oval and cushion cuts. Step-cut shapes like emerald have lower eye-clean rates at SI1. The key is to review images or the certificate plot, or ask our experts to verify eye-clean status before you buy.

Which diamond shapes hide SI1 inclusions best? +

Brilliant-cut shapes are the best at hiding SI1 inclusions. Round brilliant is the most forgiving, followed by oval, cushion, pear, and princess. These shapes have many small facets that scatter light aggressively, making it very difficult for the eye to focus on internal inclusions. Step-cut shapes (emerald, asscher) have broad, open facets and are less forgiving — for these shapes, VS2 or higher is generally recommended.

How should I evaluate an SI1 diamond before purchasing? +

Follow these three steps: (1) Review the diamond's high-resolution images or 360-degree video at actual size — if you cannot spot an inclusion without zooming in, the diamond is likely eye-clean. (2) Check the certificate inclusion plot — prefer diamonds where the main inclusion is near the edge or under a bezel/prong rather than centered under the table. (3) Favor light-colored inclusions (clouds, feathers, pinpoints) over dark crystals, as dark spots are more noticeable. Our experts evaluate every SI1 diamond for eye-clean status — contact us for a free assessment.

What is the price difference between SI1 and VS2? +

SI1 diamonds are typically 15-25% less expensive than comparable VS2 stones. On a 1-carat round brilliant, this translates to savings of approximately $800-$1,500. On a 2-carat diamond, the savings can be $2,000-$5,000. These are significant amounts that can be redirected toward a larger stone or a premium setting. For example, the savings from choosing a 1.50ct SI1 over a 1.50ct VS2 could cover the cost of a beautiful custom setting.

Is SI1 a good clarity grade for an engagement ring? +

SI1 can be an excellent choice for an engagement ring, especially if you choose a brilliant-cut shape like round, oval, or cushion. The key is selecting an eye-clean SI1 — which our team can help you identify. Many couples find that the savings from choosing SI1 allow them to get a noticeably larger diamond, which has a much bigger visual impact than an invisible clarity upgrade. An eye-clean 1.50ct SI1 will always look more impressive on the hand than a 1.00ct VS1.

Should I avoid SI1 for emerald-cut or asscher-cut diamonds? +

Not necessarily avoid, but approach with caution. Emerald and asscher cuts have broad, hall-of-mirrors facets that are less forgiving of inclusions than brilliant cuts. While some SI1 step-cut diamonds are eye-clean, the probability is lower than with round or oval shapes. For step-cut stones, we generally recommend VS2 or higher as a safer starting point. If budget is a priority and you are considering SI1 in a step cut, our experts can evaluate specific stones and confirm whether the inclusions are visible. Contact us for guidance.

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