Round|Lab Grown|IGI

1.66ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG817605189

Shape and cutting style on the report: Round brilliant

Certificate IGI LG817605189

Diamond specifications and retailer prices

From $183 USD
As of November 1, 2026
Save $880 USD (83%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,063 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG817605189 or 817605189. Listed at 10 retailers as of November 1, 2026, with prices from $183 to $1,063, a $880 spread on the same certified stone. MOH London lists it at $1,063. 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
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817605189
Dimensions7.57 × 7.62 × 4.65 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.57 mm7.62 mm1.66 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817605189
Side View
Table 62.0%Crown 33.9°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 61.2%

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 1
Current: $1,063 USD|Low: $178 USD|High: $1,790 USD|Avg: $701 USD|-2.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 4$183 USD
Retailer 7$213 USD
Retailer 2$354 USD
Retailer 5$390 USD
Retailer 9$567 USD
Retailer 8$731 USD
Retailer 6$772 USD
Retailer 10$936 USD
Retailer 3$1,060 USD
MOH London$1,063 USD

29 data points across 10 retailers

10 retailers$183 USD to $1,063 USD

A
Cheapest Retailer
-
$183 USD
A
Retailer 2
-
$213 USD
View
A
Retailer 3
-
$354 USD
£279 GBP
View
A
Retailer 4
-
$390 USD
€371 EUR
View
B+
Retailer 5
-
$567 USD
View
B+
Retailer 6
-
$731 USD
View
B+
Retailer 7
-
$772 USD
View
Retailer 8
-
$936 USD
SGD 1,265 SGD
View
Price last confirmed 20 days ago
B
Retailer 9
-
$1,060 USD
View
Most Expensive
B
MOH London
LG817605189 · Nov 1
$1,063 USD
£837 GBP
View
9 more retailers have this diamond
Prices start from $183 USDSave up to $880 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
$183 USD