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Round|Lab Grown|IGI

1.15ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG445039317

Shape and cutting style on the report: Round brilliant

Certificate IGI LG445039317

Diamond specifications and retailer prices

From £490 GBP
As of November 5, 2026
Save £2,627 GBP (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,118 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.15ct lab-grown round diamond

This 1.15ct lab-grown round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG445039317 or 445039317. Listed at 13 retailers as of November 5, 2026, with prices from £490 to £3,118, a £2,627 spread on the same certified stone. MOH London lists it at £3,118. 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

1.15
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.4°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG445039317
Dimensions6.77 × 6.78 × 4.10 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.77 mm6.78 mm1.15 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG445039317
Side View
Table 59.5%Crown 31.4°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 60.5%

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 5
Current: £3,118 GBP|Low: £490 GBP|High: £3,169 GBP|Avg: £1,304 GBP|-0.3%
MOH London
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
November 6, 2026
Retailer 8£490 GBP
Retailer 9£795 GBP
Retailer 14£865 GBP
Retailer 13£890 GBP
Retailer 10£922 GBP
Retailer 12£922 GBP
Retailer 4£1,051 GBP
Retailer 7£1,057 GBP
Retailer 5£1,317 GBP
Retailer 11£1,469 GBP
Retailer 2£1,568 GBP
Retailer 3£1,728 GBP
Retailer 6£1,870 GBP
MOH London£3,118 GBP

43 data points across 14 retailers

13 retailers£490 GBP to £3,118 GBP

A
Cheapest Retailer
-
£490 GBP
B+
Retailer 2
-
£795 GBP
View
B+
Retailer 3
-
£865 GBP
View
B+
Retailer 4
-
£890 GBP
View
Final sale: no returns
Retailer 5
-
£922 GBP
View
Price last confirmed 25 days ago
B+
Retailer 6
-
£922 GBP
View
B+
Retailer 7
-
£1,051 GBP
View
B+
Retailer 8
-
£1,057 GBP
View
B
Retailer 9
-
£1,469 GBP
View
B
Retailer 10
-
£1,568 GBP
View
B
Retailer 11
-
£1,728 GBP
View
B
Retailer 12
-
£1,870 GBP
View
Most Expensive
B
MOH London
LG445039317 · Nov 5
£3,118 GBP
View
12 more retailers have this diamond
Prices start from £490 GBPSave up to £2,627 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
1.15ct Round
£490 GBP