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Heart|Lab Grown|IGI

1.67ct E SI1 Heart Lab Grown Diamond

ID • E/SI1 • IGI LG642477401

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG642477401

Diamond specifications and retailer prices

From £181 GBP
$242 USD
As of October 30, 2026
Save £767 GBP (81%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,411 GBP at Brilliant Earth · As of October 12, 2026
View at Brilliant Earth

About this 1.67ct lab-grown heart diamond

This 1.67ct lab-grown heart sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG642477401 or 642477401. Listed at 16 retailers as of October 30, 2026, with a 425% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.67
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG642477401
Dimensions8.14 × 6.99 × 5.08 mm
L/W Ratio1.16
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.14 mm6.99 mm1.67 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG642477401
Side View
Table 60.0%Crown 35.4°Girdle: STK-THKPavilion 41.1°Culet: NoneDepth 62.4%

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: £948 GBP|Low: £174 GBP|High: £1,448 GBP|Avg: £468 GBP|-34.5%
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
Retailer 15
October 30, 2026
Retailer 15£181 GBP
Retailer 9£202 GBP
Retailer 13£210 GBP
Retailer 5£224 GBP
Retailer 6£224 GBP
Retailer 2£288 GBP
Retailer 14£302 GBP
Retailer 7£423 GBP
Retailer 8£425 GBP
Retailer 10£445 GBP
Retailer 4£472 GBP
Retailer 12£561 GBP
Retailer 3£721 GBP
Retailer 11£903 GBP
Brilliant Earth£948 GBP

29 data points across 15 retailers

16 retailers£181 GBP to £948 GBP

A
Cheapest Retailer
-
£181 GBP
$242 USD
A
Retailer 2
-
£202 GBP
$270 USD
View
Final sale: no returns
A
Retailer 3
-
£210 GBP
$281 USD
View
A
Retailer 4
-
£224 GBP
$300 USD
View
A
Retailer 5
-
£224 GBP
$300 USD
View
A
Retailer 6
-
£288 GBP
View
B+
Retailer 7
-
£302 GBP
$405 USD
View
Retailer 8
-
£423 GBP
$567 USD
View
Price last confirmed 13 days ago
B+
Retailer 9
-
£425 GBP
View
B+
Retailer 10
-
£445 GBP
A$918 AUD
View
B+
Retailer 11
-
£472 GBP
$632 USD
View
B+
Retailer 12
-
£561 GBP
$752 USD
View
B
Retailer 13
-
£721 GBP
$966 USD
View
Retailer 14
-
£903 GBP
View
Price last confirmed 9 days ago
B
Retailer 15
-
£948 GBP
$1,270 USD
View
Most Expensive
Brilliant Earth
14017756A · Oct 12
£1,411 GBP
$1,890 USD
View
Price last confirmed 18 days ago
15 more retailers have this diamond
Prices start from £181 GBPSave up to £767 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
1.67ct Heart
£181 GBP