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1.66ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG445037430

Shape and cutting style on the report: Round brilliant

Certificate IGI LG445037430

Diamond specifications and retailer prices

From $1,671 NZD
$940 USD
As of November 2, 2026
Save $6,821 NZD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $8,491 NZD at MOH London · As of November 1, 2026
View at MOH London

About this 1.66ct lab-grown round diamond

This 1.66ct lab-grown round sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG445037430 or 445037430. Listed at 11 retailers as of November 1, 2026, with prices from $1,671 to $8,491, a $6,821 spread on the same certified stone. MOH London lists it at $8,491. 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

1.66
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG445037430
Dimensions7.50 × 7.46 × 4.73 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.50 mm7.46 mm1.66 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG445037430
Side View
Table 56.5%Crown 36.3°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 63.2%

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 2
Current: $8,491 NZD|Low: $1,671 NZD|High: $8,593 NZD|Avg: $3,970 NZD
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 1, 2026
Retailer 2$1,671 NZD
Retailer 5$2,278 NZD
Retailer 8$2,550 NZD
Retailer 6$2,643 NZD
Retailer 9$2,643 NZD
Retailer 10$2,950 NZD
Retailer 4$3,079 NZD
Retailer 12$3,661 NZD
Retailer 7$4,186 NZD
Retailer 11$4,927 NZD
Retailer 3$7,562 NZD
MOH London$8,491 NZD

14 data points across 12 retailers

11 retailers$1,671 NZD to $8,491 NZD

A
Cheapest Retailer
-
$1,671 NZD
$940 USD
B+
Retailer 2
-
$2,278 NZD
$1,282 USD
View
B+
Retailer 3
-
$2,479 NZD
$1,395 USD
View
B+
Retailer 4
-
$2,550 NZD
$1,435 USD
View
Final sale: no returns
Retailer 5
-
$2,643 NZD
$1,487 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
$2,643 NZD
$1,487 USD
View
B+
Retailer 7
-
$2,950 NZD
$1,660 USD
View
B
Retailer 8
-
$4,186 NZD
$2,355 USD
View
B
Retailer 9
-
$4,927 NZD
$2,772 USD
View
B
Retailer 10
-
$4,953 NZD
$2,787 USD
View
Most Expensive
B
MOH London
LG445037430 · Nov 1
$8,491 NZD
£3,762 GBP
View
10 more retailers have this diamond
Prices start from $1,671 NZDSave up to $6,821 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
1.66ct Round
$1,671 NZD