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1.51ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG487172905

Shape and cutting style on the report: Round brilliant

Certificate IGI LG487172905

Diamond specifications and retailer prices

From £627 GBP
$840 USD
As of October 31, 2026
Save £2,641 GBP (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,268 GBP at MOH London · As of October 29, 2026
View at MOH London

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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG487172905 or 487172905. Listed at 11 retailers as of October 29, 2026, with prices from £627 to £3,268, a £2,641 spread on the same certified stone. MOH London lists it at £3,268. 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.1°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG487172905
Dimensions7.45 × 7.43 × 4.47 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.45 mm7.43 mm1.51 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG487172905
Side View
Table 61.5%Crown 32.1°Girdle: MediumPavilion 41.4°Culet: NoneDepth 60.1%

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: Oct 31
Current: £3,268 GBP|Low: £627 GBP|High: £3,294 GBP|Avg: £1,474 GBP|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 2£627 GBP
Retailer 3£872 GBP
Retailer 6£977 GBP
Retailer 4£1,012 GBP
Retailer 10£1,102 GBP
Retailer 7£1,142 GBP
Retailer 9£1,437 GBP
Retailer 5£1,607 GBP
Retailer 8£1,993 GBP
MOH London£3,268 GBP

13 data points across 10 retailers

11 retailers£627 GBP to £3,268 GBP

A
Cheapest Retailer
-
£627 GBP
$840 USD
B+
Retailer 2
-
£872 GBP
$1,169 USD
View
B+
Retailer 3
-
£949 GBP
$1,271 USD
View
B+
Retailer 4
-
£977 GBP
$1,309 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,012 GBP
$1,356 USD
View
Retailer 6
-
£1,012 GBP
$1,356 USD
View
Price last confirmed 20 days ago
B+
Retailer 7
-
£1,142 GBP
$1,530 USD
View
B
Retailer 8
-
£1,607 GBP
$2,153 USD
View
B
Retailer 9
-
£1,896 GBP
$2,541 USD
View
B
Retailer 10
-
£1,993 GBP
$2,671 USD
View
Most Expensive
B
MOH London
LG487172905 · Oct 29
£3,268 GBP
View
10 more retailers have this diamond
Prices start from £627 GBPSave up to £2,641 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
£627 GBP