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Round|Lab Grown|IGI

1.66ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG589308920

Shape and cutting style on the report: Round brilliant

Certificate IGI LG589308920

Diamond specifications and retailer prices

From $198 USD
As of October 29, 2026
Save $1,912 USD (91%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,110 USD at Jared · As of October 28, 2026
View at Jared

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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG589308920 or 589308920. Listed at 11 retailers as of October 28, 2026, with prices from $198 to $2,110, a $1,912 spread on the same certified stone. Jared lists it at $2,110. 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
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG589308920
Dimensions7.61 × 7.65 × 4.68 mm
L/W Ratio1.01
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
7.61 mm7.65 mm1.66 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG589308920
Side View
Table 56.0%Crown 34.2°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.3%

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: Oct 29
Current: $500 USD|Low: $164 USD|High: $1,940 USD|Avg: $732 USD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
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Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 29, 2026
Retailer 14$198 USD
Retailer 15$224 USD
Retailer 13$230 USD
Retailer 12$426 USD
Retailer 1$500 USD
Retailer 5$544 USD
Retailer 4$602 USD
Retailer 3$608 USD
Retailer 6$619 USD
Retailer 7$625 USD
Retailer 9$792 USD
Retailer 10$871 USD
Retailer 8$1,087 USD
Retailer 2$1,340 USD
Retailer 11$1,900 USD

32 data points across 15 retailers

11 retailers$198 USD to $2,110 USD

A
Cheapest Retailer
-
$198 USD
A
Retailer 2
-
$224 USD
View
Final sale: no returns
A
Retailer 3
-
$230 USD
View
B+
Retailer 4
-
$426 USD
View
A
Retailer 5
-
$500 USD
£394 GBP
View
B+
Retailer 6
-
$792 USD
View
B+
Retailer 7
-
$871 USD
View
B
Retailer 8
-
$1,087 USD
£856 GBP
View
B
Retailer 9
-
$1,340 USD
View
B
Retailer 10
-
$1,900 USD
View
Most Expensive
B
Jared
150062110 · Oct 28
$2,110 USD
View
10 more retailers have this diamond
Prices start from $198 USDSave up to $1,912 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
$198 USD