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Round|Lab Grown|IGI

1.66ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG520211728

Shape and cutting style on the report: Round brilliant

Certificate IGI LG520211728

Diamond specifications and retailer prices

From $229 USD
As of November 1, 2026
Save $1,056 USD (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $1,285 USD at Reve Diamonds · As of November 1, 2026
View at Reve Diamonds

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 LG520211728 or 520211728. Listed at 19 retailers as of November 1, 2026, with prices from $229 to $1,285, a $1,056 spread on the same certified stone. Reve Diamonds lists it at $1,285. 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 angle34.9°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520211728
Dimensions7.64 × 7.56 × 4.72 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
7.64 mm7.56 mm1.66 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520211728
Side View
Table 55.0%Crown 34.9°Girdle: MediumPavilion 40.7°Culet: NoneDepth 62.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: $458 USD|Low: $220 USD|High: $1,151 USD|Avg: $563 USD|-4.8%
Retailer 1
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Retailer 11
Retailer 12
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Retailer 16
November 2, 2026
Retailer 15$229 USD
Retailer 6$255 USD
Retailer 4$265 USD
Retailer 2$284 USD
Retailer 7$284 USD
Retailer 11$382 USD
Retailer 1$458 USD
Retailer 9$524 USD
Retailer 13$577 USD
Retailer 8$584 USD
Retailer 3$617 USD
Retailer 10$699 USD
Retailer 14$830 USD
Retailer 5$912 USD
Retailer 16$1,060 USD
Retailer 12$1,143 USD

44 data points across 16 retailers

19 retailers$229 USD to $1,285 USD

A
Cheapest Retailer
-
$229 USD
A
Retailer 2
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$255 USD
View
Final sale: no returns
A
Retailer 3
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$265 USD
View
Retailer 4
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$284 USD
View
Price last confirmed 8 days ago
A
Retailer 5
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$284 USD
View
B+
Retailer 6
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$382 USD
View
A
Retailer 7
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$458 USD
€436 EUR
View
A
Retailer 8
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$523 USD
View
A
Retailer 9
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$524 USD
£413 GBP
View
B+
Retailer 10
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$577 USD
A$888 AUD
View
B+
Retailer 11
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$584 USD
View
B+
Retailer 12
-
$617 USD
View
B+
Retailer 13
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$699 USD
View
B+
Retailer 14
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$830 USD
View
B
Retailer 15
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$912 USD
View
B
Retailer 16
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$964 USD
View
B
Retailer 17
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$1,060 USD
View
B
Retailer 18
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$1,143 USD
£900 GBP
View
Most Expensive
B
Reve Diamonds
012BC4F0D · Nov 1
$1,285 USD
View
18 more retailers have this diamond
Prices start from $229 USDSave up to $1,056 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
$229 USD