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Cushion|Lab Grown|IGI

3.03ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG579395083

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG579395083

Diamond specifications and retailer prices

From £414 GBP
As of November 6, 2026
Save £3,135 GBP (88%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,549 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 3.03ct lab-grown cushion diamond

This 3.03ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG579395083 or 579395083. Listed at 12 retailers as of November 6, 2026, with prices from £414 to £3,549, a £3,135 spread on the same certified stone. Brilliant Earth lists it at £3,549. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.03
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.2°
Pavilion angle38.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG579395083
Dimensions8.36 × 8.31 × 5.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
8.36 mm8.31 mm3.03 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG579395083
Side View
Table 64.0%Crown 41.2°Girdle: MED-STKPavilion 38.2°Culet: NoneDepth 66.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £3,549 GBP|Low: £414 GBP|High: £3,668 GBP|Avg: £1,136 GBP|-3.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 4£414 GBP
Retailer 11£458 GBP
Retailer 7£560 GBP
Retailer 9£614 GBP
Retailer 12£678 GBP
Retailer 2£684 GBP
Retailer 5£754 GBP
Retailer 10£1,033 GBP
Retailer 3£1,157 GBP
Retailer 8£1,472 GBP
Retailer 6£1,907 GBP
Brilliant Earth£3,549 GBP

42 data points across 12 retailers

12 retailers£414 GBP to £3,549 GBP

A
Cheapest Retailer
-
£414 GBP
Final sale: no returns
Retailer 2
-
£458 GBP
View
Price last confirmed 22 days ago
A
Retailer 3
-
£560 GBP
View
B+
Retailer 4
-
£614 GBP
View
A
Retailer 5
-
£678 GBP
View
A
Retailer 6
-
£684 GBP
View
A
Retailer 7
-
£754 GBP
View
B+
Retailer 8
-
£1,033 GBP
View
B+
Retailer 9
-
£1,157 GBP
View
B+
Retailer 10
-
£1,472 GBP
View
B
Retailer 11
-
£1,907 GBP
View
Most Expensive
B
Brilliant Earth
16211350A · Nov 6
£3,549 GBP
$4,750 USD
View
11 more retailers have this diamond
Prices start from £414 GBPSave up to £3,135 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
3.03ct Cushion
£414 GBP