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Round|Lab Grown|IGI

1.51ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG12251714

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12251714

Diamond specifications and retailer prices

From £252 GBP
As of November 5, 2026
Save £1,096 GBP (81%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £2,236 GBP at Do Amore Diamonds · As of November 6, 2026
View at Do Amore Diamonds

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 LG12251714 or 12251714. Listed at 20 retailers as of November 1, 2026, with a 435% 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
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12251714
Dimensions7.34 × 7.38 × 4.60 mm
L/W Ratio1.01
Cert comments
As Grown - No indications of post-growth treatment. This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process.
Top View
7.34 mm7.38 mm1.51 ctF / SI1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12251714
Side View
Table 58.0%Crown 35.5°Girdle: THN-UNDPavilion 41.6°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: Nov 5
Current: £2,236 GBP|Low: £252 GBP|High: £2,236 GBP|Avg: £737 GBP
Do Amore Diamonds
Retailer 2
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Retailer 20
November 6, 2026
Retailer 4£252 GBP
Retailer 5£268 GBP
Retailer 20£293 GBP
Retailer 7£313 GBP
Retailer 19£313 GBP
Retailer 18£321 GBP
Retailer 9£427 GBP
Retailer 15£499 GBP
Retailer 14£513 GBP
Retailer 3£558 GBP
Retailer 13£615 GBP
Retailer 2£630 GBP
Retailer 12£630 GBP
Retailer 8£917 GBP
Retailer 10£987 GBP
Retailer 16£1,062 GBP
Retailer 6£1,109 GBP
Retailer 11£1,224 GBP
Retailer 17£1,348 GBP
Do Amore Diamonds£2,236 GBP

21 data points across 20 retailers

20 retailers£252 GBP to £1,348 GBP

A
Cheapest Retailer
-
£252 GBP
A
Retailer 2
-
£268 GBP
View
A
Retailer 3
-
£293 GBP
View
Retailer 4
-
£313 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£313 GBP
View
B+
Retailer 6
-
£321 GBP
View
B+
Retailer 7
-
£427 GBP
View
B+
Retailer 8
-
£499 GBP
View
B+
Retailer 9
-
£513 GBP
View
B
Retailer 10
-
£558 GBP
View
B+
Retailer 11
-
£615 GBP
View
B+
Retailer 12
-
£630 GBP
View
B
Retailer 13
-
£630 GBP
View
B
Retailer 14
-
£917 GBP
View
B
Retailer 15
-
£987 GBP
View
B
Retailer 16
-
£1,062 GBP
View
B
Retailer 17
-
£1,109 GBP
View
B
Retailer 18
-
£1,224 GBP
View
B
Retailer 19
-
£1,348 GBP
View
Most Expensive
Do Amore Diamonds
27-AE3F019FF · Nov 6
£2,236 GBP
$3,010 USD
View
Price under review
19 more retailers have this diamond
Prices start from £252 GBPSave up to £1,096 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
£252 GBP