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Home / Diamonds / SI1 Clarity

SI1 Diamonds

SI1 — slightly included — is usually eye-clean, particularly in brilliant cuts, at a meaningful saving over VS grades. It is the value-hunter’s grade, and we help you find the cleanest-facing SI1 stones.

51,743 certified SI1 clarity diamonds in stock — natural and lab-grown.

Filter all SI1 diamonds

0.21 ct lab-grown Round Diamond

Round Diamond

$79

Carat: 0.21 ct
Color: D
Clarity: SI1
Cut: Fair

0.21 ct lab-grown Oval Diamond

Oval Diamond

$82

Carat: 0.21 ct
Color: E
Clarity: SI1
Cut: -

0.24 ct lab-grown Round Diamond

Round Diamond

$83

Carat: 0.24 ct
Color: D
Clarity: SI1
Cut: Very Good

0.23 ct lab-grown Oval Diamond

Oval Diamond

$83

Carat: 0.23 ct
Color: D
Clarity: SI1
Cut: -

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Ideal

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Very Good

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Very Good

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Excellent

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: E
Clarity: SI1
Cut: Very Good

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Ideal

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: Ideal

0.27 ct lab-grown Round Diamond

Round Diamond

$87

Carat: 0.27 ct
Color: E
Clarity: SI1
Cut: Very Good

0.28 ct lab-grown Round Diamond

Round Diamond

$89

Carat: 0.28 ct
Color: D
Clarity: SI1
Cut: Very Good

0.28 ct lab-grown Round Diamond

Round Diamond

$89

Carat: 0.28 ct
Color: D
Clarity: SI1
Cut: Very Good

0.28 ct lab-grown Round Diamond

Round Diamond

$89

Carat: 0.28 ct
Color: D
Clarity: SI1
Cut: Very Good

0.27 ct lab-grown Pear Diamond

Pear Diamond

$89

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: -

0.15 ct lab-grown Round Diamond

Round Diamond

$90

Carat: 0.15 ct
Color: D
Clarity: SI1
Cut: Very Good

0.2 ct lab-grown Round Diamond

Round Diamond

$91

Carat: 0.20 ct
Clarity: SI1
Cut: Excellent

0.22 ct lab-grown Round Diamond

Round Diamond

$93

Carat: 0.22 ct
Color: D
Clarity: SI1
Cut: Ideal

0.16 ct lab-grown Round Diamond

Round Diamond

$93

Carat: 0.16 ct
Color: D
Clarity: SI1
Cut: Excellent

0.16 ct lab-grown Round Diamond

Round Diamond

$93

Carat: 0.16 ct
Color: D
Clarity: SI1
Cut: Very Good

0.28 ct lab-grown Round Diamond

Round Diamond

$93

Carat: 0.28 ct
Color: D
Clarity: SI1
Cut: Very Good

0.3 ct lab-grown Round Diamond

Round Diamond

$93

Carat: 0.30 ct
Color: D
Clarity: SI1
Cut: Very Good

0.27 ct lab-grown Pear Diamond

Pear Diamond

$94

Carat: 0.27 ct
Color: D
Clarity: SI1
Cut: -

SI1 diamonds — common questions

Is a SI1 diamond eye-clean?: Often — many SI1 stones are eye-clean, especially round brilliants, but it varies, so each SI1 should be viewed individually (we flag the eye-clean ones).
What does SI1 clarity mean?: SI1 means 'slightly included, first degree' — inclusions are noticeable under magnification and occasionally visible to a keen eye.
Is SI1 clarity good value?: SI1 is strong value — frequently eye-clean for far less than VS, letting you put the budget into size or color.

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VVS1 Clarity
VVS2 Clarity
VS1 Clarity
VS2 Clarity
SI2 Clarity
D Color
G Color
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