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Heart|Lab Grown|IGI

1.28ct E SI1 Heart Lab Grown Diamond

ID • E/SI1 • IGI LG752551204

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG752551204

Diamond specifications and retailer prices

From £137 GBP
As of November 6, 2026
Save £714 GBP (84%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £850 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1.28ct lab-grown heart diamond

This 1.28ct lab-grown heart sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG752551204 or 752551204. Listed at 18 retailers as of November 6, 2026, with prices from £137 to £850, a £714 spread on the same certified stone. Reve Diamonds lists it at £850. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.28
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.9°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG752551204
Dimensions7.49 × 6.58 × 4.49 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.49 mm6.58 mm1.28 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG752551204
Side View
Table 62.0%Crown 37.9°Girdle: MED-THKPavilion 40.3°Culet: NoneDepth 59.9%

Caratlytics Score

How it works →
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 6
Current: £302 GBP|Low: £131 GBP|High: £852 GBP|Avg: £344 GBP|+3.6%
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
November 6, 2026
Retailer 11£137 GBP
Retailer 10£152 GBP
Retailer 2£158 GBP
Retailer 3£169 GBP
Retailer 12£169 GBP
Retailer 5£228 GBP
Retailer 1£302 GBP
Retailer 4£356 GBP
Retailer 8£377 GBP
Retailer 7£403 GBP
Retailer 13£544 GBP
Retailer 9£643 GBP
Retailer 6£788 GBP

45 data points across 13 retailers

18 retailers£137 GBP to £850 GBP

A
Cheapest Retailer
-
£137 GBP
A
Retailer 2
-
£152 GBP
View
Final sale: no returns
A
Retailer 3
-
£158 GBP
View
A
Retailer 4
-
£169 GBP
View
Retailer 5
-
£169 GBP
View
Price last confirmed 12 days ago
B+
Retailer 6
-
£228 GBP
View
A
Retailer 7
-
£302 GBP
View
B+
Retailer 8
-
£329 GBP
View
B+
Retailer 9
-
£356 GBP
View
B+
Retailer 10
-
£377 GBP
View
B+
Retailer 11
-
£403 GBP
View
Retailer 12
-
£428 GBP
View
Price last confirmed 11 days ago
B
Retailer 13
-
£544 GBP
View
B
Retailer 14
-
£551 GBP
View
B
Retailer 15
-
£584 GBP
View
B
Retailer 16
-
£643 GBP
View
B
Retailer 17
-
£788 GBP
View
Most Expensive
B
Reve Diamonds
6E563C587 · Nov 6
£850 GBP
$1,138 USD
View
17 more retailers have this diamond
Prices start from £137 GBPSave up to £714 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 Heart
£137 GBP