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Cushion|Lab Grown|IGI

1.38ct D FL Cushion Lab Grown Diamond

VG • D/FL • IGI LG840629940

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG840629940

Diamond specifications and retailer prices

From £385 GBP
$516 USD
As of November 3, 2026
Save £1,557 GBP (80%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,942 GBP at Helzberg Diamonds · As of November 3, 2026
View at Helzberg Diamonds

About this 1.38ct lab-grown cushion diamond

This 1.38ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG840629940 or 840629940. Listed at 15 retailers as of November 3, 2026, with prices from £385 to £1,942, a £1,557 spread on the same certified stone. Helzberg Diamonds lists it at £1,942. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.38
Carat
D
Colour
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle35°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840629940
Dimensions8.18 × 5.62 × 3.75 mm
L/W Ratio1.46
Girdle conditionFaceted
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
8.18 mm5.62 mm1.38 ctD / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840629940
Side View
Table 58.0%Crown 34.7°Girdle: STK-THKPavilion 35°Culet: NoneDepth 66.7%

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: Nov 3
Current: £1,942 GBP|Low: £385 GBP|High: £2,161 GBP|Avg: £1,038 GBP
Helzberg Diamonds
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
November 3, 2026
Retailer 11£385 GBP
Retailer 9£423 GBP
Retailer 7£518 GBP
Retailer 14£584 GBP
Retailer 13£642 GBP
Retailer 4£645 GBP
Retailer 8£679 GBP
Retailer 10£709 GBP
Retailer 5£773 GBP
Retailer 2£1,181 GBP
Retailer 6£1,425 GBP
Retailer 12£1,509 GBP
Retailer 3£1,923 GBP
Helzberg Diamonds£1,942 GBP

6 data points across 14 retailers

15 retailers£385 GBP to £1,942 GBP

A
Cheapest Retailer
-
£385 GBP
$516 USD
Final sale: no returns
A
Retailer 2
-
£423 GBP
View
A
Retailer 3
-
£518 GBP
$695 USD
View
A
Retailer 4
-
£584 GBP
$784 USD
View
A
Retailer 5
-
£642 GBP
€820 EUR
View
A
Retailer 6
-
£645 GBP
$866 USD
View
A
Retailer 7
-
£679 GBP
View
A
Retailer 8
-
£709 GBP
ZAR 15,361 ZAR
View
A
Retailer 9
-
£773 GBP
$1,037 USD
View
B+
Retailer 10
-
£1,181 GBP
$1,585 USD
View
B
Retailer 11
-
£1,425 GBP
SGD 2,585 SGD
View
B
Retailer 12
-
£1,509 GBP
View
B
Retailer 13
-
£1,524 GBP
$2,045 USD
View
B
Retailer 14
-
£1,923 GBP
$2,580 USD
View
Most Expensive
B
Helzberg Diamonds
ZXZOKGMIPPKG · Nov 3
£1,942 GBP
$2,606 USD
View
14 more retailers have this diamond
Prices start from £385 GBPSave up to £1,557 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
1.38ct Cushion
£385 GBP