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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 €204 EUR
$229 USD
As of November 1, 2026
Save €942 EUR (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: €1,146 EUR 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 €204 to €1,146, a €942 spread on the same certified stone. Reve Diamonds lists it at €1,146. 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: €408 EUR|Low: €196 EUR|High: €1,026 EUR|Avg: €502 EUR|-4.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 2, 2026
Retailer 15€204 EUR
Retailer 6€227 EUR
Retailer 4€236 EUR
Retailer 2€253 EUR
Retailer 7€253 EUR
Retailer 11€341 EUR
Retailer 1€408 EUR
Retailer 9€468 EUR
Retailer 13€515 EUR
Retailer 8€521 EUR
Retailer 3€550 EUR
Retailer 10€623 EUR
Retailer 14€740 EUR
Retailer 5€813 EUR
Retailer 16€945 EUR
Retailer 12€1,019 EUR

44 data points across 16 retailers

19 retailers€204 EUR to €1,146 EUR

A
Cheapest Retailer
-
€204 EUR
$229 USD
A
Retailer 2
-
€227 EUR
$255 USD
View
Final sale: no returns
A
Retailer 3
-
€236 EUR
$265 USD
View
Retailer 4
-
€253 EUR
$284 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
€253 EUR
$284 USD
View
B+
Retailer 6
-
€341 EUR
$382 USD
View
A
Retailer 7
-
€408 EUR
View
A
Retailer 8
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€466 EUR
$523 USD
View
A
Retailer 9
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€468 EUR
£413 GBP
View
B+
Retailer 10
-
€515 EUR
A$888 AUD
View
B+
Retailer 11
-
€521 EUR
$584 USD
View
B+
Retailer 12
-
€550 EUR
$617 USD
View
B+
Retailer 13
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€623 EUR
$699 USD
View
B+
Retailer 14
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€740 EUR
$830 USD
View
B
Retailer 15
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€813 EUR
$912 USD
View
B
Retailer 16
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€860 EUR
$964 USD
View
B
Retailer 17
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€945 EUR
$1,060 USD
View
B
Retailer 18
-
€1,019 EUR
£900 GBP
View
Most Expensive
B
Reve Diamonds
012BC4F0D · Nov 1
€1,146 EUR
$1,285 USD
View
18 more retailers have this diamond
Prices start from €204 EURSave up to €942 EUR

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
€204 EUR