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Oval|Lab Grown|IGI

1.66ct D IF Oval Lab Grown Diamond

ID • D/IF • IGI LG815677209

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG815677209

Diamond specifications and retailer prices

From $356 USD
As of November 1, 2026
Save $2,774 USD (89%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $3,130 USD at Brilliant Earth · As of November 2, 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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG815677209 or 815677209. Listed at 24 retailers as of November 1, 2026, with prices from $356 to $3,130, a $2,774 spread on the same certified stone. Brilliant Earth lists it at $3,130. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG815677209
Dimensions9.58 × 6.65 × 4.15 mm
L/W Ratio1.44
Girdle conditionFaceted
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
9.58 mm6.65 mm1.66 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG815677209
Side View
Table 59.0%Crown 34.3°Girdle: MED-THKPavilion 40.5°Culet: NoneDepth 62.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: $3,130 USD|Low: $356 USD|High: $4,260 USD|Avg: $1,231 USD|-26.5%
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
Retailer 17
November 3, 2026
Retailer 5$356 USD
Retailer 11$417 USD
Retailer 14$550 USD
Retailer 17$555 USD
Retailer 13$638 USD
Retailer 12$679 USD
Retailer 2$703 USD
Retailer 6$889 USD
Retailer 16$918 USD
Retailer 15$962 USD
Retailer 4$1,201 USD
Retailer 8$1,312 USD
Retailer 10$1,515 USD
Retailer 3$1,569 USD
Retailer 7$1,581 USD
Retailer 9$2,780 USD
Brilliant Earth$3,130 USD

29 data points across 17 retailers

24 retailers$356 USD to $3,130 USD

Retailer 1
-
$321 USD
Price last confirmed 23 days ago
Retailer 2
-
$325 USD
View
Price last confirmed 40 days ago
A
Retailer 3
-
$356 USD
View
Final sale: no returns
Retailer 4
-
$377 USD
View
Price last confirmed 38 days ago
Retailer 5
-
$398 USD
View
Price last confirmed 21 days ago
Retailer 6
-
$398 USD
View
Price last confirmed 38 days ago
Retailer 7
-
$398 USD
View
Price last confirmed 31 days ago
A
Retailer 8
-
$417 USD
£328 GBP
View
A
Retailer 9
-
$550 USD
View
A
Retailer 10
-
$555 USD
View
A
Retailer 11
-
$638 USD
€608 EUR
View
A
Retailer 12
-
$679 USD
ZAR 10,976 ZAR
View
A
Retailer 13
-
$703 USD
£553 GBP
View
Retailer 14
-
$889 USD
View
Price last confirmed 7 days ago
A
Retailer 15
-
$918 USD
A$1,413 AUD
View
A
Retailer 16
-
$962 USD
View
B+
Retailer 17
-
$1,201 USD
View
Retailer 18
-
$1,281 USD
View
Price last confirmed 26 days ago
B+
Retailer 19
-
$1,312 USD
View
B+
Retailer 20
-
$1,515 USD
View
B+
Retailer 21
-
$1,569 USD
View
Retailer 22
-
$1,581 USD
£1,245 GBP
View
Price last confirmed 7 days ago
B
Retailer 23
-
$2,780 USD
View
Most Expensive
B
Brilliant Earth
21017101A · Nov 2
$3,130 USD
View
23 more retailers have this diamond
Prices start from $356 USDSave up to $2,774 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 Oval
$356 USD