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Radiant|Lab Grown|IGI

3.91ct D VS1 Radiant Lab Grown Diamond

EX • D/VS1 • IGI LG819641021

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG819641021

Diamond specifications and retailer prices

From £549 GBP
$735 USD
As of October 29, 2026
Save £3,511 GBP (86%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,060 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.91ct lab-grown radiant diamond

This 3.91ct lab-grown radiant sits in the three to five carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG819641021 or 819641021. Listed at 21 retailers as of October 29, 2026, with prices from £549 to £4,060, a £3,511 spread on the same certified stone. Brilliant Earth lists it at £4,060. 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

3.91
Carat
D
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.1°
Pavilion angle37.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG819641021
Dimensions11.25 × 7.76 × 4.90 mm
L/W Ratio1.45
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.25 mm7.76 mm3.91 ctD / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG819641021
Side View
Table 63.0%Crown 44.1°Girdle: STK-THKPavilion 37.4°Culet: NoneDepth 63.1%

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: £4,060 GBP|Low: £470 GBP|High: £6,426 GBP|Avg: £1,280 GBP|+1.7%
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 17£490 GBP
Retailer 6£549 GBP
Retailer 3£569 GBP
Retailer 9£569 GBP
Retailer 5£702 GBP
Retailer 2£763 GBP
Retailer 16£813 GBP
Retailer 8£878 GBP
Retailer 10£909 GBP
Retailer 13£991 GBP
Retailer 14£1,291 GBP
Retailer 12£1,320 GBP
Retailer 15£1,452 GBP
Retailer 7£1,552 GBP
Retailer 4£1,939 GBP
Retailer 11£2,408 GBP
Brilliant Earth£4,060 GBP

33 data points across 17 retailers

21 retailers£549 GBP to £4,060 GBP

Retailer 1
-
£490 GBP
$657 USD
Price last confirmed 22 days ago
Retailer 2
-
£533 GBP
$714 USD
View
Price last confirmed 15 days ago
A
Retailer 3
-
£549 GBP
$735 USD
View
Final sale: no returns
Retailer 4
-
£569 GBP
$762 USD
View
Price last confirmed 27 days ago
Retailer 5
-
£569 GBP
$762 USD
View
Price last confirmed 18 days ago
A
Retailer 6
-
£702 GBP
$940 USD
View
A
Retailer 7
-
£763 GBP
View
B+
Retailer 8
-
£813 GBP
$1,090 USD
View
A
Retailer 9
-
£878 GBP
$1,176 USD
View
A
Retailer 10
-
£909 GBP
View
Retailer 11
-
£991 GBP
€1,265 EUR
View
Price last confirmed 7 days ago
Retailer 12
-
£1,291 GBP
A$2,661 AUD
View
Price last confirmed 9 days ago
A
Retailer 13
-
£1,320 GBP
ZAR 28,566 ZAR
View
B+
Retailer 14
-
£1,452 GBP
$1,945 USD
View
B+
Retailer 15
-
£1,552 GBP
$2,080 USD
View
Retailer 16
-
£1,598 GBP
$2,141 USD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
£1,763 GBP
View
B+
Retailer 18
-
£1,939 GBP
$2,598 USD
View
B+
Retailer 19
-
£1,961 GBP
$2,627 USD
View
B
Retailer 20
-
£2,408 GBP
View
Most Expensive
B
Brilliant Earth
20916393A · Oct 30
£4,060 GBP
$5,440 USD
View
20 more retailers have this diamond
Prices start from £549 GBPSave up to £3,511 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
3.91ct Radiant
£549 GBP