Cushion|Lab Grown|IGI

4.51ct H VS1 Cushion Lab Grown Diamond

ID • H/VS1 • IGI LG839647911

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG839647911

Diamond specifications and retailer prices

From £640 GBP
HK$6,700 HKD
As of October 31, 2026
Save £1,956 GBP (75%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £2,596 GBP at With Clarity · As of October 31, 2026
View at With Clarity

About this 4.51ct lab-grown cushion diamond

This 4.51ct lab-grown cushion sits in the three to five carat band, graded H colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG839647911 or 839647911. Listed at 17 retailers as of October 31, 2026, with prices from £640 to £2,596, a £1,956 spread on the same certified stone. With Clarity lists it at £2,596. 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

4.51
Carat
H
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle32.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG839647911
Dimensions11.33 × 8.15 × 5.44 mm
L/W Ratio1.39
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.33 mm8.15 mm4.51 ctH / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG839647911
Side View
Table 59.0%Crown 34.9°Girdle: MED-THKPavilion 32.9°Culet: NoneDepth 66.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £851 GBP|Low: £535 GBP|High: £4,456 GBP|Avg: £1,576 GBP|-3.0%
Retailer 1
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
With Clarity
October 31, 2026
Retailer 4£535 GBP
Retailer 12£640 GBP
Retailer 9£671 GBP
Retailer 14£683 GBP
Retailer 1£851 GBP
Retailer 15£907 GBP
Retailer 2£1,047 GBP
Retailer 5£1,169 GBP
Retailer 7£1,221 GBP
Retailer 10£1,279 GBP
Retailer 6£1,729 GBP
Retailer 13£1,849 GBP
Retailer 17£1,850 GBP
Retailer 3£1,914 GBP
Retailer 8£2,135 GBP
Retailer 16£2,339 GBP
Retailer 11£2,358 GBP
With Clarity£2,596 GBP

22 data points across 18 retailers

17 retailers£640 GBP to £2,596 GBP

A
Cheapest Retailer
-
£640 GBP
HK$6,700 HKD
Retailer 2
-
£671 GBP
View
Price last confirmed 14 days ago
A
Retailer 3
-
£683 GBP
$915 USD
View
A
Retailer 4
-
£851 GBP
€1,086 EUR
View
B+
Retailer 5
-
£907 GBP
$1,215 USD
View
A
Retailer 6
-
£1,047 GBP
$1,403 USD
View
Retailer 7
-
£1,169 GBP
ZAR 25,314 ZAR
View
Price last confirmed 7 days ago
Retailer 8
-
£1,221 GBP
A$2,516 AUD
View
Price last confirmed 11 days ago
A
Retailer 9
-
£1,279 GBP
$1,714 USD
View
B+
Retailer 10
-
£1,729 GBP
View
B+
Retailer 11
-
£1,849 GBP
SGD 3,348 SGD
View
B+
Retailer 12
-
£1,850 GBP
$2,479 USD
View
B+
Retailer 13
-
£1,914 GBP
$2,565 USD
View
Retailer 14
-
£2,135 GBP
$2,860 USD
View
Price last confirmed 13 days ago
B+
Retailer 15
-
£2,339 GBP
View
B+
Retailer 16
-
£2,358 GBP
$3,160 USD
View
Most Expensive
B+
With Clarity
839647911 · Oct 31
£2,596 GBP
$3,478 USD
View
16 more retailers have this diamond
Prices start from £640 GBPSave up to £1,956 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
4.51ct Cushion
£640 GBP