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Cushion|Lab Grown|IGI

3.23ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG629454997

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG629454997

Diamond specifications and retailer prices

From £352 GBP
$471 USD
As of October 29, 2026
Save £2,290 GBP (87%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,642 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.23ct lab-grown cushion diamond

This 3.23ct 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 LG629454997 or 629454997. Listed at 12 retailers as of October 29, 2026, with prices from £352 to £2,642, a £2,290 spread on the same certified stone. Brilliant Earth lists it at £2,642. 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

3.23
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.4°
Pavilion angle38.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629454997
Dimensions8.63 × 8.39 × 5.65 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.63 mm8.39 mm3.23 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629454997
Side View
Table 63.0%Crown 38.4°Girdle: STK-THKPavilion 38.4°Culet: NoneDepth 67.3%

Caratlytics Score

How it works →
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: Oct 29
Current: £2,642 GBP|Low: £352 GBP|High: £3,784 GBP|Avg: £922 GBP|-30.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 4£352 GBP
Retailer 3£389 GBP
Retailer 10£584 GBP
Retailer 7£590 GBP
Retailer 9£601 GBP
Retailer 2£605 GBP
Retailer 5£654 GBP
Retailer 12£986 GBP
Retailer 11£1,211 GBP
Retailer 8£1,270 GBP
Retailer 6£1,447 GBP
Brilliant Earth£2,642 GBP

43 data points across 12 retailers

12 retailers£352 GBP to £2,642 GBP

A
Cheapest Retailer
-
£352 GBP
$471 USD
Final sale: no returns
A
Retailer 2
-
£389 GBP
$521 USD
View
B+
Retailer 3
-
£584 GBP
$782 USD
View
A
Retailer 4
-
£590 GBP
$790 USD
View
A
Retailer 5
-
£601 GBP
$805 USD
View
A
Retailer 6
-
£605 GBP
View
A
Retailer 7
-
£654 GBP
€835 EUR
View
B+
Retailer 8
-
£986 GBP
$1,321 USD
View
B+
Retailer 9
-
£1,211 GBP
$1,623 USD
View
B+
Retailer 10
-
£1,270 GBP
$1,702 USD
View
B+
Retailer 11
-
£1,447 GBP
View
Most Expensive
B
Brilliant Earth
14069332A · Oct 30
£2,642 GBP
$3,540 USD
View
11 more retailers have this diamond
Prices start from £352 GBPSave up to £2,290 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
3.23ct Cushion
£352 GBP