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Round|Lab Grown|IGI

1.66ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG499105537

Shape and cutting style on the report: Round brilliant

Certificate IGI LG499105537

Diamond specifications and retailer prices

From $432 USD
As of October 28, 2026
Save $650 USD (60%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,292 USD at MOH London · As of October 19, 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 LG499105537 or 499105537. Listed at 5 retailers as of October 27, 2026, with a 150% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG499105537
Dimensions7.67 × 7.59 × 4.65 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.67 mm7.59 mm1.66 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG499105537
Side View
Table 58.0%Crown 34°GirdlePavilion 40.9°Culet: NoneDepth 61.0%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: $1,292 USD|Low: $432 USD|High: $1,300 USD|Avg: $698 USD|-0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 27, 2026
Retailer 3$432 USD
Retailer 6$480 USD
Retailer 4$534 USD
Retailer 5$574 USD
Retailer 2$607 USD
Retailer 7$1,082 USD
MOH London$1,292 USD

22 data points across 7 retailers

5 retailers$432 USD to $1,082 USD

B+
Cheapest Retailer
-
$432 USD
B+
Retailer 2
-
$534 USD
View
B+
Retailer 3
-
$607 USD
£478 GBP
View
B
Retailer 4
-
$1,082 USD
View
Most Expensive
MOH London
LG499105537 · Oct 19
$1,292 USD
£1,017 GBP
View
Price last confirmed 14 days ago
4 more retailers have this diamond
Prices start from $432 USDSave up to $650 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.

B+
1.66ct Round
$432 USD