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Round|Lab Grown|IGI

1.15ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG492136381

Shape and cutting style on the report: Round brilliant

Certificate IGI LG492136381

Diamond specifications and retailer prices

From £493 GBP
$660 USD
As of October 30, 2026
Save £1,502 GBP (75%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,529 GBP at MOH London · As of October 19, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG492136381 or 492136381. Listed at 12 retailers as of October 30, 2026, with a 305% 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

1.15
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG492136381
Dimensions6.72 × 6.77 × 4.07 mm
L/W Ratio1.01
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
6.72 mm6.77 mm1.15 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG492136381
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 60.4%

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: Oct 30
Current: £2,529 GBP|Low: £493 GBP|High: £2,545 GBP|Avg: £1,121 GBP|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 2£493 GBP
Retailer 5£552 GBP
Retailer 9£617 GBP
Retailer 6£640 GBP
Retailer 8£640 GBP
Retailer 10£772 GBP
Retailer 3£1,005 GBP
Retailer 7£1,038 GBP
Retailer 4£1,578 GBP
Retailer 11£1,995 GBP
MOH London£2,529 GBP

12 data points across 11 retailers

12 retailers£493 GBP to £1,995 GBP

A
Cheapest Retailer
-
£493 GBP
$660 USD
A
Retailer 2
-
£552 GBP
$740 USD
View
A
Retailer 3
-
£601 GBP
$805 USD
View
A
Retailer 4
-
£617 GBP
$827 USD
View
Final sale: no returns
A
Retailer 5
-
£640 GBP
$858 USD
View
Retailer 6
-
£640 GBP
$858 USD
View
Price last confirmed 19 days ago
A
Retailer 7
-
£772 GBP
$1,035 USD
View
B+
Retailer 8
-
£1,038 GBP
$1,391 USD
View
B
Retailer 9
-
£1,578 GBP
$2,114 USD
View
B
Retailer 10
-
£1,801 GBP
$2,413 USD
View
B
Retailer 11
-
£1,995 GBP
$2,673 USD
View
Most Expensive
MOH London
LG492136381 · Oct 19
£2,529 GBP
View
Price last confirmed 12 days ago
11 more retailers have this diamond
Prices start from £493 GBPSave up to £1,502 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
£493 GBP