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Round|Lab Grown|IGI

1.55ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG450028046

Shape and cutting style on the report: Round brilliant

Certificate IGI LG450028046

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)
12 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 LG450028046 or 450028046. Listed at 12 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 angle35.8°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG450028046
Dimensions7.37 × 7.40 × 4.62 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD). Type IIa
Top View
7.37 mm7.40 mm1.55 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG450028046
Side View
Table 55.5%Crown 35.8°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.6%

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: £1,666 GBP
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
November 6, 2026
Retailer 6£639 GBP
Retailer 7£1,047 GBP
Retailer 11£1,139 GBP
Retailer 10£1,172 GBP
Retailer 8£1,215 GBP
Retailer 13£1,215 GBP
Retailer 3£1,341 GBP
Retailer 5£1,658 GBP
Retailer 9£1,916 GBP
Retailer 2£2,184 GBP
Retailer 4£2,204 GBP
Retailer 12£2,277 GBP
MOH London£3,469 GBP

39 data points across 13 retailers

12 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
-
£2,184 GBP
View
B
Retailer 10
-
£2,204 GBP
View
B
Retailer 11
-
£2,277 GBP
View
Most Expensive
B
MOH London
LG450028046 · Nov 3
£3,469 GBP
View
11 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