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1.20ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451056607

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056607

Diamond specifications and retailer prices

From $1,227 NZD
As of November 5, 2026
Save $6,144 NZD (83%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $7,372 NZD at MOH London · As of November 5, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056607 or 451056607. Listed at 13 retailers as of November 5, 2026, with prices from $1,227 to $7,372, a $6,144 spread on the same certified stone. MOH London lists it at $7,372. 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

1.20
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056607
Dimensions6.85 × 6.89 × 4.17 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.85 mm6.89 mm1.20 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056607
Side View
Table 60.0%Crown 32.2°GirdlePavilion 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: $7,372 NZD|Low: $1,227 NZD|High: $7,480 NZD|Avg: $3,108 NZD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 5$1,227 NZD
Retailer 6$1,983 NZD
Retailer 11$2,158 NZD
Retailer 10$2,222 NZD
Retailer 7$2,300 NZD
Retailer 9$2,300 NZD
Retailer 2$2,640 NZD
Retailer 8$3,659 NZD
Retailer 4$3,910 NZD
Retailer 3$4,312 NZD
MOH London$7,372 NZD

45 data points across 11 retailers

13 retailers$1,227 NZD to $7,372 NZD

A
Cheapest Retailer
-
$1,227 NZD
B+
Retailer 2
-
$1,983 NZD
View
B+
Retailer 3
-
$2,158 NZD
View
B+
Retailer 4
-
$2,222 NZD
View
Final sale: no returns
Retailer 5
-
$2,300 NZD
View
Price last confirmed 25 days ago
B+
Retailer 6
-
$2,300 NZD
View
B+
Retailer 7
-
$2,606 NZD
View
B+
Retailer 8
-
$2,640 NZD
View
B
Retailer 9
-
$3,659 NZD
View
B
Retailer 10
-
$3,910 NZD
View
B
Retailer 11
-
$4,312 NZD
View
B
Retailer 12
-
$4,666 NZD
View
Most Expensive
B
MOH London
LG451056607 · Nov 5
$7,372 NZD
£3,263 GBP
View
12 more retailers have this diamond
Prices start from $1,227 NZDSave up to $6,144 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
1.20ct Round
$1,227 NZD