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Round|Lab Grown|IGI

1.66ct H SI1 Round Lab Grown Diamond

VG • H/SI1 • IGI LG754510430

Shape and cutting style on the report: Round brilliant

Certificate IGI LG754510430

Diamond specifications and retailer prices

From $193 USD
As of November 1, 2026
Save $928 USD (83%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,121 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG754510430 or 754510430. Listed at 12 retailers as of November 1, 2026, with prices from $193 to $1,121, a $928 spread on the same certified stone. MOH London lists it at $1,121. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.66
Carat
H
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754510430
Dimensions7.49 × 7.44 × 4.81 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.49 mm7.44 mm1.66 ctH / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754510430
Side View
Table 56.0%Crown 37°Girdle: MED-STKPavilion 41.3°Culet: NoneDepth 64.4%

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 1
Current: $1,121 USD|Low: $193 USD|High: $1,430 USD|Avg: $667 USD|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 1, 2026
Retailer 6$193 USD
Retailer 12$224 USD
Retailer 7$240 USD
Retailer 4$246 USD
Retailer 3$408 USD
Retailer 13$419 USD
Retailer 11$503 USD
Retailer 10$660 USD
Retailer 8$771 USD
Retailer 9$774 USD
Retailer 5$874 USD
Retailer 2$900 USD
MOH London$1,121 USD

24 data points across 13 retailers

12 retailers$193 USD to $1,121 USD

A
Cheapest Retailer
-
$193 USD
A
Retailer 2
-
$224 USD
View
A
Retailer 3
-
$240 USD
View
Retailer 4
-
$246 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$408 USD
€389 EUR
View
B+
Retailer 6
-
$419 USD
View
A
Retailer 7
-
$503 USD
View
A
Retailer 8
-
$660 USD
View
A
Retailer 9
-
$771 USD
View
A
Retailer 10
-
$774 USD
View
B+
Retailer 11
-
$900 USD
View
Most Expensive
A
MOH London
LG754510430 · Nov 1
$1,121 USD
£883 GBP
View
11 more retailers have this diamond
Prices start from $193 USDSave up to $928 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
$193 USD