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Heart|Lab Grown|IGI

1.25ct E SI1 Heart Lab Grown Diamond

EX • E/SI1 • IGI LG770664488

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG770664488

Diamond specifications and retailer prices

From £152 GBP
As of November 4, 2026
Save £697 GBP (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £848 GBP at Reve Diamonds · As of November 4, 2026
View at Reve Diamonds

About this 1.25ct lab-grown heart diamond

This 1.25ct 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 LG770664488 or 770664488. Listed at 13 retailers as of November 4, 2026, with prices from £152 to £848, a £697 spread on the same certified stone. Reve Diamonds lists it at £848. 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

1.25
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle33.7°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770664488
Dimensions6.71 × 7.46 × 4.29 mm
L/W Ratio1.11
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.71 mm7.46 mm1.25 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG770664488
Side View
Table 60.0%Crown 33.7°Girdle: MED-STKPavilion 40°Culet: NoneDepth 57.5%

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: Nov 4
Current: £300 GBP|Low: £90 GBP|High: £860 GBP|Avg: £457 GBP|-1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Reve Diamonds
November 5, 2026
Retailer 2£90 GBP
Retailer 9£152 GBP
Retailer 6£297 GBP
Retailer 1£300 GBP
Retailer 8£316 GBP
Retailer 7£410 GBP
Retailer 4£572 GBP
Retailer 10£581 GBP
Retailer 5£620 GBP
Retailer 3£785 GBP
Reve Diamonds£848 GBP

32 data points across 11 retailers

13 retailers£152 GBP to £848 GBP

A
Cheapest Retailer
-
£152 GBP
Final sale: no returns
Retailer 2
-
£161 GBP
View
Price last confirmed 38 days ago
Retailer 3
-
£170 GBP
View
Price last confirmed 40 days ago
B+
Retailer 4
-
£297 GBP
View
B+
Retailer 5
-
£300 GBP
View
B+
Retailer 6
-
£316 GBP
View
B+
Retailer 7
-
£410 GBP
View
B
Retailer 8
-
£486 GBP
View
B
Retailer 9
-
£572 GBP
View
B
Retailer 10
-
£581 GBP
View
B
Retailer 11
-
£620 GBP
View
B
Retailer 12
-
£785 GBP
View
Most Expensive
B
Reve Diamonds
FA2468553 · Nov 4
£848 GBP
$1,136 USD
View
12 more retailers have this diamond
Prices start from £152 GBPSave up to £697 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
1.25ct Heart
£152 GBP