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Round|Lab Grown|IGI

1.66ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG485136745

Shape and cutting style on the report: Round brilliant

Certificate IGI LG485136745

Diamond specifications and retailer prices

From $940 USD
As of November 2, 2026
Save $3,863 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,803 USD at MOH London · As of October 29, 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 LG485136745 or 485136745. Listed at 11 retailers as of October 29, 2026, with prices from $940 to $4,803, a $3,863 spread on the same certified stone. MOH London lists it at $4,803. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG485136745
Dimensions7.63 × 7.62 × 4.67 mm
L/W Ratio1.00
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
7.63 mm7.62 mm1.66 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG485136745
Side View
Table 56.0%Crown 35.7°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 61.3%

Caratlytics Score

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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: $4,803 USD|Low: $940 USD|High: $4,841 USD|Avg: $2,129 USD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 2$940 USD
Retailer 3$1,282 USD
Retailer 6$1,435 USD
Retailer 4$1,487 USD
Retailer 7$1,660 USD
Retailer 10$1,834 USD
Retailer 9$2,060 USD
Retailer 5$2,355 USD
Retailer 8$2,772 USD
MOH London$4,803 USD

16 data points across 10 retailers

11 retailers$940 USD to $4,803 USD

A
Cheapest Retailer
-
$940 USD
B+
Retailer 2
-
$1,282 USD
View
B+
Retailer 3
-
$1,395 USD
View
B+
Retailer 4
-
$1,435 USD
View
Final sale: no returns
Retailer 5
-
$1,487 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
$1,487 USD
View
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
LG485136745 · Oct 29
$4,803 USD
£3,782 GBP
View
10 more retailers have this diamond
Prices start from $940 USDSave up to $3,863 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