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Cushion|Lab Grown|IGI

3.28ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG544280736

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG544280736

Diamond specifications and retailer prices

From £347 GBP
$465 USD
As of October 29, 2026
Save £2,340 GBP (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,687 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.28ct lab-grown cushion diamond

This 3.28ct 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 LG544280736 or 544280736. Listed at 13 retailers as of October 29, 2026, with prices from £347 to £2,687, a £2,340 spread on the same certified stone. Brilliant Earth lists it at £2,687. 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

3.28
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle37.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG544280736
Dimensions8.62 × 8.35 × 5.43 mm
L/W Ratio1.03
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
8.62 mm8.35 mm3.28 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG544280736
Side View
Table 65.0%Crown 36.3°Girdle: MED-VTKPavilion 37.3°Culet: NoneDepth 65.0%

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: Oct 29
Current: £2,687 GBP|Low: £186 GBP|High: £3,956 GBP|Avg: £1,014 GBP|-30.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 12£347 GBP
Retailer 8£384 GBP
Retailer 4£420 GBP
Retailer 10£582 GBP
Retailer 2£607 GBP
Retailer 6£633 GBP
Retailer 7£673 GBP
Retailer 5£1,224 GBP
Retailer 3£1,261 GBP
Retailer 11£1,311 GBP
Retailer 13£1,403 GBP
Retailer 9£1,413 GBP
Brilliant Earth£2,687 GBP

37 data points across 13 retailers

13 retailers£347 GBP to £2,687 GBP

A
Cheapest Retailer
-
£347 GBP
$465 USD
Final sale: no returns
A
Retailer 2
-
£384 GBP
$515 USD
View
A
Retailer 3
-
£420 GBP
HK$4,400 HKD
View
A
Retailer 4
-
£582 GBP
$780 USD
View
B+
Retailer 5
-
£607 GBP
$813 USD
View
A
Retailer 6
-
£633 GBP
View
A
Retailer 7
-
£673 GBP
€859 EUR
View
B+
Retailer 8
-
£1,224 GBP
SGD 2,216 SGD
View
B+
Retailer 9
-
£1,261 GBP
$1,689 USD
View
B+
Retailer 10
-
£1,311 GBP
$1,756 USD
View
B+
Retailer 11
-
£1,403 GBP
$1,880 USD
View
B+
Retailer 12
-
£1,413 GBP
View
Most Expensive
B
Brilliant Earth
16422264A · Oct 30
£2,687 GBP
$3,600 USD
View
12 more retailers have this diamond
Prices start from £347 GBPSave up to £2,340 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
3.28ct Cushion
£347 GBP