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Cushion|Lab Grown|IGI

1.23ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG836620499

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG836620499

Diamond specifications and retailer prices

From £343 GBP
$460 USD
As of November 1, 2026
Save £1,433 GBP (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,776 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.23ct lab-grown cushion diamond

This 1.23ct lab-grown cushion sits in the classic one-carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG836620499 or 836620499. Listed at 14 retailers as of October 31, 2026, with prices from £343 to £1,776, a £1,433 spread on the same certified stone. Brilliant Earth lists it at £1,776. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.23
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle34.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836620499
Dimensions7.83 × 5.25 × 3.62 mm
L/W Ratio1.49
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
7.83 mm5.25 mm1.23 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836620499
Side View
Table 60.0%Crown 34°Girdle: MED-THKPavilion 34.2°Culet: NoneDepth 69.0%

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 1
Current: £1,776 GBP|Low: £343 GBP|High: £2,069 GBP|Avg: £947 GBP|-10.5%
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
November 1, 2026
Retailer 13£343 GBP
Retailer 10£369 GBP
Retailer 8£481 GBP
Retailer 7£581 GBP
Retailer 3£585 GBP
Retailer 2£607 GBP
Retailer 12£629 GBP
Retailer 9£635 GBP
Retailer 4£889 GBP
Retailer 5£1,190 GBP
Retailer 14£1,215 GBP
Retailer 6£1,422 GBP
Retailer 11£1,446 GBP
Brilliant Earth£1,776 GBP

39 data points across 14 retailers

14 retailers£343 GBP to £1,776 GBP

A
Cheapest Retailer
-
£343 GBP
$460 USD
Final sale: no returns
Retailer 2
-
£369 GBP
$495 USD
View
Price last confirmed 7 days ago
A
Retailer 3
-
£481 GBP
$645 USD
View
A
Retailer 4
-
£581 GBP
€741 EUR
View
A
Retailer 5
-
£585 GBP
$784 USD
View
A
Retailer 6
-
£607 GBP
View
A
Retailer 7
-
£629 GBP
$843 USD
View
A
Retailer 8
-
£635 GBP
ZAR 13,747 ZAR
View
B+
Retailer 9
-
£889 GBP
$1,191 USD
View
Retailer 10
-
£1,190 GBP
$1,595 USD
View
Price last confirmed 18 days ago
B+
Retailer 11
-
£1,215 GBP
$1,628 USD
View
Retailer 12
-
£1,422 GBP
View
Price last confirmed 22 days ago
B+
Retailer 13
-
£1,446 GBP
View
Most Expensive
B
Brilliant Earth
21589747A · Oct 31
£1,776 GBP
$2,380 USD
View
13 more retailers have this diamond
Prices start from £343 GBPSave up to £1,433 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
1.23ct Cushion
£343 GBP