SI Diamonds: Understanding Slightly Included Diamonds
SI Diamonds: Understanding Slightly Included Diamonds
SI diamonds are among the most commonly chosen clarity grades for engagement rings.
The term SI stands for Slightly Included, referring to natural inclusions that are visible under magnification.
While these inclusions are easier to detect than those found in higher clarity grades, many SI diamonds still appear beautiful to the naked eye.
Understanding how SI diamonds are graded can help you decide whether they are the right choice for your jewellery.
What Does SI Mean in Diamond Clarity?
The SI clarity grade indicates that a diamond contains inclusions that are noticeable under 10× magnification.
These inclusions may include:
- Small crystals
- Feathers
- Clouding
- Pinpoints
Their visibility depends on their size, location and number.
SI1 vs SI2 Diamonds
The SI clarity range is divided into two grades.
SI1 Diamonds
SI1 diamonds have inclusions that are visible under magnification but are often not visible to the naked eye.
Many SI1 diamonds are considered eye-clean.
SI2 Diamonds
SI2 diamonds contain inclusions that are more noticeable and may sometimes be visible without magnification.
The visibility depends heavily on where the inclusion sits within the diamond.
Are SI Diamonds Eye Clean?
Many SI1 diamonds appear eye-clean, particularly when the inclusions are located near the edge of the stone or hidden by the diamond’s facets.
However, this varies between individual diamonds.
Viewing the diamond in person is often the best way to determine how noticeable inclusions are.
Why Some Clients Choose SI Diamonds
SI diamonds are often chosen because they can provide excellent value while still appearing beautiful.
If the inclusions are well positioned and not visible without magnification, the diamond can look very similar to higher clarity grades.
This makes SI diamonds a popular choice for clients looking to maximise diamond size or cut quality while staying within a certain budget.
How Clarity Works With Other Diamond Characteristics
Clarity is only one part of a diamond’s overall beauty.
A well-cut diamond will often appear far more brilliant than a poorly cut diamond with higher clarity.
When selecting a diamond, it is important to consider clarity alongside:
Exploring Diamond Clarity
You may also find these clarity guides helpful:
Learning how these clarity grades compare can make selecting a diamond much easier.
