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Round|Lab Grown|IGI

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 €838 EUR
$940 USD
As of November 2, 2026
Save €3,422 EUR (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €4,260 EUR 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 €838 to €4,260, a €3,422 spread on the same certified stone. MOH London lists it at €4,260. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €4,260 EUR|Low: €838 EUR|High: €4,311 EUR|Avg: €1,992 EUR
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€838 EUR
Retailer 5€1,143 EUR
Retailer 8€1,279 EUR
Retailer 6€1,326 EUR
Retailer 9€1,326 EUR
Retailer 10€1,480 EUR
Retailer 4€1,545 EUR
Retailer 12€1,837 EUR
Retailer 7€2,100 EUR
Retailer 11€2,471 EUR
Retailer 3€3,793 EUR
MOH London€4,260 EUR

14 data points across 12 retailers

11 retailers€838 EUR to €4,260 EUR

A
Cheapest Retailer
-
€838 EUR
$940 USD
B+
Retailer 2
-
€1,143 EUR
$1,282 USD
View
B+
Retailer 3
-
€1,244 EUR
$1,395 USD
View
B+
Retailer 4
-
€1,279 EUR
$1,435 USD
View
Final sale: no returns
Retailer 5
-
€1,326 EUR
$1,487 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
€1,326 EUR
$1,487 USD
View
B+
Retailer 7
-
€1,480 EUR
$1,660 USD
View
B
Retailer 8
-
€2,100 EUR
$2,355 USD
View
B
Retailer 9
-
€2,471 EUR
$2,772 USD
View
B
Retailer 10
-
€2,485 EUR
$2,787 USD
View
Most Expensive
B
MOH London
LG445037430 · Nov 1
€4,260 EUR
£3,762 GBP
View
10 more retailers have this diamond
Prices start from €838 EURSave up to €3,422 EUR

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
€838 EUR