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Round|Lab Grown|IGI

1.51ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG770643638

Shape and cutting style on the report: Round brilliant

Certificate IGI LG770643638

Diamond specifications and retailer prices

From £185 GBP
As of November 4, 2026
Save £758 GBP (80%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £1,055 GBP at Brilliant Earth · As of October 16, 2026
View at Brilliant Earth

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG770643638 or 770643638. Listed at 22 retailers as of November 4, 2026, with a 410% 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

1.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770643638
Dimensions7.36 × 7.31 × 4.56 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.36 mm7.31 mm1.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG770643638
Side View
Table 56.0%Crown 35.1°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £1,055 GBP|Low: £158 GBP|High: £1,055 GBP|Avg: £464 GBP
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
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 9£166 GBP
Retailer 16£185 GBP
Retailer 5£206 GBP
Retailer 17£206 GBP
Retailer 3£323 GBP
Retailer 6£351 GBP
Retailer 2£357 GBP
Retailer 11£376 GBP
Retailer 12£379 GBP
Retailer 4£395 GBP
Retailer 18£429 GBP
Retailer 14£542 GBP
Retailer 10£663 GBP
Retailer 15£665 GBP
Retailer 8£701 GBP
Retailer 13£823 GBP
Retailer 7£943 GBP
Brilliant Earth£1,055 GBP

41 data points across 18 retailers

22 retailers£185 GBP to £943 GBP

Retailer 1
-
£166 GBP
Price last confirmed 19 days ago
A
Retailer 2
-
£185 GBP
View
Final sale: no returns
Retailer 3
-
£191 GBP
View
Price last confirmed 24 days ago
A
Retailer 4
-
£193 GBP
View
Retailer 5
-
£206 GBP
View
Price last confirmed 12 days ago
Retailer 6
-
£206 GBP
View
Price last confirmed 21 days ago
A
Retailer 7
-
£323 GBP
View
A
Retailer 8
-
£351 GBP
View
A
Retailer 9
-
£357 GBP
View
A
Retailer 10
-
£376 GBP
View
A
Retailer 11
-
£379 GBP
View
B+
Retailer 12
-
£395 GBP
View
B+
Retailer 13
-
£429 GBP
View
B+
Retailer 14
-
£542 GBP
View
B
Retailer 15
-
£573 GBP
View
Retailer 16
-
£657 GBP
View
Price last confirmed 46 days ago
Retailer 17
-
£663 GBP
View
Price last confirmed 19 days ago
B
Retailer 18
-
£665 GBP
View
B
Retailer 19
-
£701 GBP
View
B
Retailer 20
-
£823 GBP
View
B
Retailer 21
-
£943 GBP
View
Most Expensive
Brilliant Earth
19882042A · Oct 16
£1,055 GBP
$1,420 USD
View
Price last confirmed 21 days ago
21 more retailers have this diamond
Prices start from £185 GBPSave up to £758 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
1.51ct Round
£185 GBP