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Round|Lab Grown|IGI

1.66ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG480173846

Shape and cutting style on the report: Round brilliant

Certificate IGI LG480173846

Diamond specifications and retailer prices

From $940 USD
As of November 2, 2026
Save $3,838 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,778 USD 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 LG480173846 or 480173846. Listed at 11 retailers as of November 1, 2026, with prices from $940 to $4,778, a $3,838 spread on the same certified stone. MOH London lists it at $4,778. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.9°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG480173846
Dimensions7.68 × 7.61 × 4.63 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.68 mm7.61 mm1.66 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG480173846
Side View
Table 60.5%Crown 32.9°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 60.5%

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 2
Current: $4,778 USD|Low: $940 USD|High: $4,841 USD|Avg: $2,150 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2$940 USD
Retailer 3$1,282 USD
Retailer 6$1,436 USD
Retailer 4$1,487 USD
Retailer 7$1,660 USD
Retailer 10$1,732 USD
Retailer 9$2,060 USD
Retailer 5$2,355 USD
Retailer 8$2,772 USD
MOH London$4,778 USD

15 data points across 10 retailers

11 retailers$940 USD to $4,778 USD

A
Cheapest Retailer
-
$940 USD
B+
Retailer 2
-
$1,282 USD
View
B+
Retailer 3
-
$1,395 USD
View
B+
Retailer 4
-
$1,436 USD
View
Final sale: no returns
B+
Retailer 5
-
$1,487 USD
View
Retailer 6
-
$1,487 USD
View
Price last confirmed 20 days ago
B+
Retailer 7
-
$1,660 USD
View
B
Retailer 8
-
$2,355 USD
View
B
Retailer 9
-
$2,772 USD
View
B
Retailer 10
-
$2,787 USD
View
Most Expensive
B
MOH London
LG480173846 · Nov 1
$4,778 USD
£3,762 GBP
View
10 more retailers have this diamond
Prices start from $940 USDSave up to $3,838 USD

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
$940 USD