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Oval|Lab Grown|IGI

1.66ct D SI1 Oval Lab Grown Diamond

ID • D/SI1 • IGI LG520284681

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG520284681

Diamond specifications and retailer prices

From €196 EUR
$219 USD
As of November 1, 2026
Save €950 EUR (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: €1,146 EUR at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.66ct lab-grown oval diamond

This 1.66ct lab-grown oval 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 LG520284681 or 520284681. Listed at 17 retailers as of October 31, 2026, with prices from €196 to €1,146, a €950 spread on the same certified stone. Brilliant Earth 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 angle36.5°
Pavilion angle39.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520284681
Dimensions9.55 × 6.80 × 4.10 mm
L/W Ratio1.40
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
9.55 mm6.80 mm1.66 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520284681
Side View
Table 60.5%Crown 36.5°Girdle: MED-STKPavilion 39.4°Culet: NoneDepth 60.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: €1,146 EUR|Low: €196 EUR|High: €1,146 EUR|Avg: €569 EUR
Brilliant Earth
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 8€196 EUR
Retailer 6€219 EUR
Retailer 5€227 EUR
Retailer 14€243 EUR
Retailer 11€270 EUR
Retailer 16€327 EUR
Retailer 2€451 EUR
Retailer 12€473 EUR
Retailer 15€475 EUR
Retailer 4€523 EUR
Retailer 3€781 EUR
Retailer 13€783 EUR
Retailer 7€828 EUR
Retailer 9€868 EUR
Retailer 10€973 EUR
Brilliant Earth€1,146 EUR

37 data points across 16 retailers

17 retailers€196 EUR to €1,146 EUR

A
Cheapest Retailer
-
€196 EUR
$219 USD
A
Retailer 2
-
€219 EUR
$245 USD
View
Final sale: no returns
A
Retailer 3
-
€227 EUR
$254 USD
View
A
Retailer 4
-
€243 EUR
$271 USD
View
Retailer 5
-
€262 EUR
$293 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
€270 EUR
£238 GBP
View
B+
Retailer 7
-
€327 EUR
$365 USD
View
A
Retailer 8
-
€451 EUR
£397 GBP
View
A
Retailer 9
-
€473 EUR
View
A
Retailer 10
-
€475 EUR
$531 USD
View
B+
Retailer 11
-
€523 EUR
$584 USD
View
B+
Retailer 12
-
€781 EUR
$872 USD
View
B+
Retailer 13
-
€783 EUR
$875 USD
View
B+
Retailer 14
-
€828 EUR
$925 USD
View
B+
Retailer 15
-
€868 EUR
$970 USD
View
B
Retailer 16
-
€973 EUR
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Oct 31
€1,146 EUR
$1,280 USD
View
16 more retailers have this diamond
Prices start from €196 EURSave up to €950 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 Oval
€196 EUR