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Round|Lab Grown|IGI

1.55ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG483197577

Shape and cutting style on the report: Round brilliant

Certificate IGI LG483197577

Diamond specifications and retailer prices

From £639 GBP
As of November 5, 2026
Save £2,830 GBP (82%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,469 GBP at MOH London · As of November 3, 2026
View at MOH London

About this 1.55ct lab-grown round diamond

This 1.55ct lab-grown round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG483197577 or 483197577. Listed at 11 retailers as of November 3, 2026, with prices from £639 to £3,469, a £2,830 spread on the same certified stone. MOH London lists it at £3,469. 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

1.55
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.9°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG483197577
Dimensions7.51 × 7.48 × 4.54 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
7.51 mm7.48 mm1.55 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG483197577
Side View
Table 60.0%Crown 32.9°Girdle: THN-MEDPavilion 41.5°Culet: NoneDepth 60.6%

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: £3,469 GBP|Low: £639 GBP|High: £3,515 GBP|Avg: £1,850 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 2£639 GBP
Retailer 4£1,047 GBP
Retailer 7£1,172 GBP
Retailer 5£1,215 GBP
Retailer 8£1,341 GBP
Retailer 3£1,389 GBP
Retailer 10£1,658 GBP
Retailer 6£1,916 GBP
Retailer 9£2,204 GBP
MOH London£3,469 GBP
Retailer 11£3,476 GBP

14 data points across 11 retailers

11 retailers£639 GBP to £3,469 GBP

A
Cheapest Retailer
-
£639 GBP
B+
Retailer 2
-
£1,047 GBP
View
B+
Retailer 3
-
£1,139 GBP
View
B+
Retailer 4
-
£1,172 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,215 GBP
View
Retailer 6
-
£1,215 GBP
View
Price last confirmed 25 days ago
B+
Retailer 7
-
£1,341 GBP
View
B
Retailer 8
-
£1,916 GBP
View
B
Retailer 9
-
£2,204 GBP
View
B
Retailer 10
-
£2,277 GBP
View
Most Expensive
B
MOH London
LG483197577 · Nov 3
£3,469 GBP
View
10 more retailers have this diamond
Prices start from £639 GBPSave up to £2,830 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
1.55ct Round
£639 GBP