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Round|Lab Grown|IGI

1.28ct D FL Round Lab Grown Diamond

ID • D/FL • IGI LG836617751

Shape and cutting style on the report: Round brilliant

Certificate IGI LG836617751

Diamond specifications and retailer prices

From £228 GBP
$304 USD
As of October 30, 2026
Save £1,183 GBP (84%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,412 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.28ct lab-grown round diamond

This 1.28ct lab-grown round 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 top-tier cut grade and certified by IGI LG836617751 or 836617751. Listed at 16 retailers as of October 29, 2026, with prices from £228 to £1,412, a £1,183 spread on the same certified stone. Brilliant Earth lists it at £1,412. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836617751
Dimensions6.90 × 6.95 × 4.31 mm
L/W Ratio1.01
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
6.90 mm6.95 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836617751
Side View
Table 58.0%Crown 35.8°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.2%

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 30
Current: £1,412 GBP|Low: £228 GBP|High: £1,667 GBP|Avg: £661 GBP|-15.3%
Brilliant Earth
Retailer 2
Retailer 3
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Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 16
October 30, 2026
Retailer 7£228 GBP
Retailer 4£253 GBP
Retailer 3£394 GBP
Retailer 2£402 GBP
Retailer 5£418 GBP
Retailer 10£419 GBP
Retailer 12£434 GBP
Retailer 9£443 GBP
Retailer 6£593 GBP
Retailer 16£776 GBP
Retailer 14£821 GBP
Retailer 8£851 GBP
Retailer 13£901 GBP
Retailer 11£1,019 GBP
Retailer 15£1,198 GBP
Brilliant Earth£1,412 GBP

27 data points across 16 retailers

16 retailers£228 GBP to £1,412 GBP

A
Cheapest Retailer
-
£228 GBP
$304 USD
Final sale: no returns
A
Retailer 2
-
£253 GBP
$337 USD
View
A
Retailer 3
-
£394 GBP
$525 USD
View
A
Retailer 4
-
£402 GBP
View
A
Retailer 5
-
£418 GBP
$557 USD
View
A
Retailer 6
-
£419 GBP
€532 EUR
View
A
Retailer 7
-
£434 GBP
ZAR 9,344 ZAR
View
A
Retailer 8
-
£443 GBP
View
A
Retailer 9
-
£593 GBP
$790 USD
View
B+
Retailer 10
-
£776 GBP
$1,034 USD
View
B+
Retailer 11
-
£821 GBP
SGD 1,477 SGD
View
B+
Retailer 12
-
£851 GBP
$1,133 USD
View
B+
Retailer 13
-
£901 GBP
$1,200 USD
View
B+
Retailer 14
-
£1,019 GBP
View
Retailer 15
-
£1,198 GBP
$1,595 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
21640958A · Oct 29
£1,412 GBP
$1,880 USD
View
15 more retailers have this diamond
Prices start from £228 GBPSave up to £1,183 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
1.28ct Round
£228 GBP