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Round|Lab Grown|IGI

4.28ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG744513762

Shape and cutting style on the report: Round brilliant

Certificate IGI LG744513762

Diamond specifications and retailer prices

From £1,441 GBP
As of October 30, 2026
Save £8,597 GBP (86%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £10,038 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 4.28ct lab-grown round diamond

This 4.28ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG744513762 or 744513762. Listed at 18 retailers as of October 30, 2026, with prices from £1,441 to £10,038, a £8,597 spread on the same certified stone. Brilliant Earth lists it at £10,038. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.28
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG744513762
Dimensions10.35 × 10.42 × 6.42 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS 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
10.35 mm10.42 mm4.28 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG744513762
Side View
Table 57.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
A+
Exceptional
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 30
Current: £10,038 GBP|Low: £1,424 GBP|High: £17,927 GBP|Avg: £4,241 GBP|-44.0%
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
Retailer 14
Retailer 15
Retailer 16
Retailer 17
October 30, 2026
Retailer 2£1,441 GBP
Retailer 13£1,451 GBP
Retailer 4£1,578 GBP
Retailer 14£1,755 GBP
Retailer 7£2,183 GBP
Retailer 3£2,553 GBP
Retailer 12£2,635 GBP
Retailer 16£2,763 GBP
Retailer 9£2,838 GBP
Retailer 10£3,000 GBP
Retailer 5£3,874 GBP
Retailer 6£4,075 GBP
Retailer 11£4,582 GBP
Retailer 17£5,046 GBP
Retailer 8£8,223 GBP
Retailer 15£9,978 GBP
Brilliant Earth£10,038 GBP

37 data points across 17 retailers

18 retailers£1,441 GBP to £10,038 GBP

A+
Cheapest Retailer
-
£1,441 GBP
A
Retailer 2
-
£1,451 GBP
$1,944 USD
View
A
Retailer 3
-
£1,578 GBP
$2,115 USD
View
A
Retailer 4
-
£1,755 GBP
$2,352 USD
View
A
Retailer 5
-
£1,824 GBP
$2,444 USD
View
Final sale: no returns
A
Retailer 6
-
£2,183 GBP
$2,925 USD
View
A
Retailer 7
-
£2,553 GBP
$3,421 USD
View
A
Retailer 8
-
£2,635 GBP
$3,531 USD
View
A
Retailer 9
-
£2,763 GBP
$3,702 USD
View
A
Retailer 10
-
£2,838 GBP
$3,803 USD
View
A
Retailer 11
-
£3,000 GBP
€3,828 EUR
View
A
Retailer 12
-
£3,874 GBP
$5,191 USD
View
Retailer 13
-
£4,075 GBP
A$8,401 AUD
View
Price last confirmed 8 days ago
B+
Retailer 14
-
£4,582 GBP
$6,140 USD
View
B+
Retailer 15
-
£5,046 GBP
View
Retailer 16
-
£8,223 GBP
A$16,951 AUD
View
Price last confirmed 21 days ago
B
Retailer 17
-
£9,978 GBP
$13,370 USD
View
Most Expensive
B
Brilliant Earth
17187543Y · Oct 30
£10,038 GBP
$13,450 USD
View
17 more retailers have this diamond
Prices start from £1,441 GBPSave up to £8,597 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+
4.28ct Round
£1,441 GBP