What is an SI1 Clarity Diamond
SI1, or Slightly Included 1 diamonds, exhibit inclusions that are noticeable under 10x magnification by a trained gemologist. While 1 inclusion may be visible to the naked eye, generally, these inclusions go undetected unless magnified.
What to Avoid in an SI1 Clarity Diamond
Avoid diamonds with clarity grades influenced by clouds or a single large inclusion. In the SI1 range, several inclusion types may be present. Diamonds with grade-setting clouds often appear hazy or milky due to large clusters of pinpoints, impeding light reflection and resulting in a dull appearance. These diamonds usually come at a discount, so avoid buying the cheapest SI1 diamond purely based on price. Additionally, the GIA does not plot clouds on the grading report, potentially leading to a misleading representation of clarity.
Also, refrain from choosing diamonds with a single, large inclusion such as a crystal. Naturally formed during the diamond’s growth, these crystals often appear black and can be visible in white light, detracting from the diamond’s beauty.
How to Buy an SI1 Diamond
Some SI1 diamonds present excellent value with small inclusions that are imperceptible without magnification. A single feather inclusion is typically acceptable as it is less visible. Consider diamonds with twinning wisps or inclusions located on the sides. Inclusions near the girdle can often be concealed with prongs when the diamond is set in jewelry, making these diamonds particularly desirable. Note that larger diamonds tend to highlight these imperfections more prominently. For diamonds 0.70ct or below, the visibility of the clarity grade should not be a major concern, but for those 1.00ct or greater, the inclusions may be more noticeable.
If you’re weighing the differences between SI1 and VS2, we recommend opting for VS if it fits within your budget. SI diamonds often have visible inclusions that could be bothersome, so it’s better to be cautious as this is a lifelong investment.
