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Round|Lab Grown|IGI

1.28ct D FL Round Lab Grown Diamond

ID • D/FL • IGI LG800679326

Shape and cutting style on the report: Round brilliant

Certificate IGI LG800679326

Diamond specifications and retailer prices

From £375 GBP
HK$3,900 HKD
As of October 30, 2026
Save £1,525 GBP (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,900 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 LG800679326 or 800679326. Listed at 12 retailers as of October 29, 2026, with prices from £375 to £1,900, a £1,525 spread on the same certified stone. Brilliant Earth lists it at £1,900. 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 angle35.2°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800679326
Dimensions6.88 × 6.94 × 4.29 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
6.88 mm6.94 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800679326
Side View
Table 58.0%Crown 35.2°Girdle: MediumPavilion 40.9°Culet: NoneDepth 62.0%

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 30
Current: £1,900 GBP|Low: £375 GBP|High: £2,215 GBP|Avg: £925 GBP|-14.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 11£375 GBP
Retailer 12£458 GBP
Retailer 6£527 GBP
Retailer 2£581 GBP
Retailer 7£595 GBP
Retailer 8£613 GBP
Retailer 9£740 GBP
Retailer 3£1,073 GBP
Retailer 4£1,209 GBP
Retailer 10£1,241 GBP
Retailer 5£1,272 GBP
Brilliant Earth£1,900 GBP

42 data points across 12 retailers

12 retailers£375 GBP to £1,900 GBP

A
Cheapest Retailer
-
£375 GBP
HK$3,900 HKD
A
Retailer 2
-
£458 GBP
$610 USD
View
A
Retailer 3
-
£527 GBP
€669 EUR
View
A
Retailer 4
-
£581 GBP
View
A
Retailer 5
-
£595 GBP
A$1,218 AUD
View
A
Retailer 6
-
£613 GBP
$816 USD
View
B+
Retailer 7
-
£740 GBP
$986 USD
View
B+
Retailer 8
-
£1,073 GBP
$1,429 USD
View
Retailer 9
-
£1,209 GBP
$1,610 USD
View
Price last confirmed 23 days ago
B+
Retailer 10
-
£1,241 GBP
$1,653 USD
View
B+
Retailer 11
-
£1,272 GBP
View
Most Expensive
B
Brilliant Earth
20788373A · Oct 29
£1,900 GBP
$2,530 USD
View
11 more retailers have this diamond
Prices start from £375 GBPSave up to £1,525 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
£375 GBP