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1.55ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG783641986

Shape and cutting style on the report: Round brilliant

Certificate IGI LG783641986

Diamond specifications and retailer prices

From £204 GBP
As of November 6, 2026
Save £612 GBP (75%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £816 GBP at MOH London · As of November 5, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG783641986 or 783641986. Listed at 19 retailers as of November 5, 2026, with prices from £204 to £816, a £612 spread on the same certified stone. MOH London lists it at £816. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG783641986
Dimensions7.42 × 7.38 × 4.59 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.42 mm7.38 mm1.55 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG783641986
Side View
Table 57.0%Crown 34.2°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.1%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £816 GBP|Low: £165 GBP|High: £828 GBP|Avg: £434 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 11£165 GBP
Retailer 3£204 GBP
Retailer 10£204 GBP
Retailer 12£275 GBP
Retailer 2£336 GBP
Retailer 5£375 GBP
Retailer 4£394 GBP
Retailer 9£414 GBP
Retailer 7£565 GBP
Retailer 8£658 GBP
Retailer 6£788 GBP
MOH London£816 GBP

43 data points across 12 retailers

19 retailers£204 GBP to £816 GBP

Retailer 1
-
£165 GBP
Price last confirmed 27 days ago
Retailer 2
-
£191 GBP
View
Price last confirmed 24 days ago
Retailer 3
-
£204 GBP
View
Price last confirmed 12 days ago
Retailer 4
-
£204 GBP
View
Price last confirmed 35 days ago
A
Retailer 5
-
£204 GBP
View
B+
Retailer 6
-
£275 GBP
View
A
Retailer 7
-
£336 GBP
View
A
Retailer 8
-
£345 GBP
View
A
Retailer 9
-
£375 GBP
View
A
Retailer 10
-
£394 GBP
View
B+
Retailer 11
-
£414 GBP
View
B+
Retailer 12
-
£539 GBP
View
B+
Retailer 13
-
£565 GBP
View
Retailer 14
-
£656 GBP
View
Price last confirmed 30 days ago
B
Retailer 15
-
£658 GBP
View
B
Retailer 16
-
£661 GBP
View
B
Retailer 17
-
£780 GBP
View
B
Retailer 18
-
£788 GBP
View
Most Expensive
B
MOH London
LG783641986 · Nov 5
£816 GBP
View
18 more retailers have this diamond
Prices start from £204 GBPSave up to £612 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
£204 GBP