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Oval|Lab Grown|IGI

4.21ct D IF Oval Lab Grown Diamond

EX • D/IF • IGI LG754594340

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG754594340

Diamond specifications and retailer prices

From £1,697 GBP
$2,274 USD
As of October 29, 2026
Save £10,160 GBP (86%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £11,857 GBP at Novita Diamonds · As of November 1, 2026
View at Novita Diamonds

About this 4.21ct lab-grown oval diamond

This 4.21ct lab-grown oval 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 LG754594340 or 754594340. Listed at 17 retailers as of October 29, 2026, with prices from £1,697 to £11,857, a £10,160 spread on the same certified stone. Novita Diamonds lists it at £11,857. 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

4.21
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754594340
Dimensions12.56 × 8.96 × 5.76 mm
L/W Ratio1.40
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
12.56 mm8.96 mm4.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754594340
Side View
Table 56.0%Crown 36°Girdle: STK-THKPavilion 40.2°Culet: NoneDepth 64.3%

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: Oct 29
Current: £11,857 GBP|Low: £1,684 GBP|High: £15,897 GBP|Avg: £4,951 GBP|+0.4%
Novita Diamonds
Retailer 2
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Retailer 4
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Retailer 7
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Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 1, 2026
Retailer 15£1,697 GBP
Retailer 10£1,846 GBP
Retailer 12£2,013 GBP
Retailer 8£2,081 GBP
Retailer 16£2,090 GBP
Retailer 5£2,987 GBP
Retailer 11£3,017 GBP
Retailer 6£3,088 GBP
Retailer 14£3,195 GBP
Retailer 2£3,532 GBP
Retailer 9£4,292 GBP
Retailer 7£4,818 GBP
Retailer 4£5,390 GBP
Retailer 17£5,849 GBP
Retailer 13£8,478 GBP
Retailer 3£11,673 GBP
Novita Diamonds£11,857 GBP

36 data points across 17 retailers

17 retailers£1,697 GBP to £11,857 GBP

A
Cheapest Retailer
-
£1,697 GBP
$2,274 USD
A
Retailer 2
-
£1,846 GBP
$2,474 USD
View
A
Retailer 3
-
£2,013 GBP
$2,697 USD
View
A
Retailer 4
-
£2,081 GBP
$2,788 USD
View
Final sale: no returns
A
Retailer 5
-
£2,090 GBP
$2,800 USD
View
A
Retailer 6
-
£2,987 GBP
$4,002 USD
View
A
Retailer 7
-
£3,017 GBP
$4,042 USD
View
A
Retailer 8
-
£3,088 GBP
$4,137 USD
View
A
Retailer 9
-
£3,195 GBP
$4,281 USD
View
A
Retailer 10
-
£3,532 GBP
€4,507 EUR
View
Retailer 11
-
£4,292 GBP
$5,751 USD
View
Price last confirmed 83 days ago
Retailer 12
-
£4,818 GBP
A$9,932 AUD
View
Price last confirmed 9 days ago
B+
Retailer 13
-
£5,390 GBP
$7,222 USD
View
B+
Retailer 14
-
£5,849 GBP
View
B
Retailer 15
-
£8,478 GBP
$11,360 USD
View
B
Retailer 16
-
£11,673 GBP
$15,640 USD
View
Most Expensive
B
Novita Diamonds
cert_754594340 · Nov 1
£11,857 GBP
A$24,442 AUD
View
16 more retailers have this diamond
Prices start from £1,697 GBPSave up to £10,160 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
4.21ct Oval
£1,697 GBP