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1.55ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG457076380

Shape and cutting style on the report: Round brilliant

Certificate IGI LG457076380

Diamond specifications and retailer prices

From $752 NZD
$424 USD
As of November 1, 2026
Save $1,271 NZD (63%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $2,024 NZD at MOH London · As of October 26, 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG457076380 or 457076380. Listed at 5 retailers as of October 26, 2026, with prices from $752 to $2,024, a $1,271 spread on the same certified stone. MOH London lists it at $2,024. 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
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG457076380
Dimensions7.41 × 7.44 × 4.59 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
HEARTS & ARROWS As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process.
Top View
7.41 mm7.44 mm1.55 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG457076380
Side View
Table 56.0%Crown 34.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 61.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $2,024 NZD|Low: $586 NZD|High: $3,478 NZD|Avg: $1,920 NZD|-1.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 3$752 NZD
Retailer 2$788 NZD
Retailer 4$843 NZD
Retailer 5$891 NZD
MOH London$2,024 NZD
Retailer 8$2,981 NZD
Retailer 6$3,478 NZD
Retailer 7$3,478 NZD

36 data points across 8 retailers

5 retailers$752 NZD to $2,024 NZD

B+
Cheapest Retailer
-
$752 NZD
$424 USD
A
Retailer 2
-
$788 NZD
£350 GBP
View
A
Retailer 3
-
$843 NZD
$475 USD
View
A
Retailer 4
-
$891 NZD
$502 USD
View
Most Expensive
B
MOH London
LG457076380 · Oct 26
$2,024 NZD
£898 GBP
View
4 more retailers have this diamond
Prices start from $752 NZDSave up to $1,271 NZD

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
$752 NZD