CaratHunter
Plans
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 $389 NZD
$219 USD
As of November 1, 2026
Save $1,886 NZD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $2,275 NZD 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG520284681 or 520284681. Listed at 17 retailers as of November 1, 2026, with prices from $389 to $2,275, a $1,886 spread on the same certified stone. Brilliant Earth lists it at $2,275. 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
Colour
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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $2,275 NZD|Low: $389 NZD|High: $2,275 NZD|Avg: $1,131 NZD
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$389 NZD
Retailer 6$435 NZD
Retailer 5$451 NZD
Retailer 14$482 NZD
Retailer 2$537 NZD
Retailer 16$649 NZD
Retailer 9$896 NZD
Retailer 12$939 NZD
Retailer 15$944 NZD
Retailer 4$1,038 NZD
Retailer 3$1,550 NZD
Retailer 13$1,555 NZD
Retailer 7$1,644 NZD
Retailer 10$1,724 NZD
Retailer 11$1,932 NZD
Brilliant Earth$2,275 NZD

36 data points across 16 retailers

17 retailers$389 NZD to $2,275 NZD

A
Cheapest Retailer
-
$389 NZD
$219 USD
A
Retailer 2
-
$435 NZD
$245 USD
View
Final sale: no returns
A
Retailer 3
-
$451 NZD
$254 USD
View
A
Retailer 4
-
$482 NZD
$271 USD
View
Retailer 5
-
$521 NZD
$293 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$537 NZD
£238 GBP
View
B+
Retailer 7
-
$649 NZD
$365 USD
View
A
Retailer 8
-
$896 NZD
£397 GBP
View
A
Retailer 9
-
$939 NZD
€503 EUR
View
A
Retailer 10
-
$944 NZD
$531 USD
View
B+
Retailer 11
-
$1,038 NZD
$584 USD
View
B+
Retailer 12
-
$1,550 NZD
$872 USD
View
B+
Retailer 13
-
$1,555 NZD
$875 USD
View
B+
Retailer 14
-
$1,644 NZD
$925 USD
View
B+
Retailer 15
-
$1,724 NZD
$970 USD
View
B
Retailer 16
-
$1,932 NZD
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Nov 2
$2,275 NZD
$1,280 USD
View
16 more retailers have this diamond
Prices start from $389 NZDSave up to $1,886 NZD

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
$389 NZD