CaratHunter
Plans
Round|Lab Grown|IGI

1.66ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG589308920

Shape and cutting style on the report: Round brilliant

Certificate IGI LG589308920

Diamond specifications and retailer prices

From $352 NZD
$198 USD
As of October 29, 2026
Save $3,398 NZD (91%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,750 NZD at Jared · As of October 28, 2026
View at Jared

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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG589308920 or 589308920. Listed at 11 retailers as of October 28, 2026, with prices from $352 to $3,750, a $3,398 spread on the same certified stone. Jared lists it at $3,750. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG589308920
Dimensions7.61 × 7.65 × 4.68 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.61 mm7.65 mm1.66 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG589308920
Side View
Table 56.0%Crown 34.2°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.3%

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: Oct 29
Current: $889 NZD|Low: $291 NZD|High: $3,448 NZD|Avg: $1,301 NZD|-1.7%
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
October 29, 2026
Retailer 14$352 NZD
Retailer 15$398 NZD
Retailer 13$409 NZD
Retailer 12$757 NZD
Retailer 1$889 NZD
Retailer 5$967 NZD
Retailer 4$1,070 NZD
Retailer 3$1,081 NZD
Retailer 6$1,100 NZD
Retailer 7$1,111 NZD
Retailer 9$1,408 NZD
Retailer 10$1,548 NZD
Retailer 8$1,932 NZD
Retailer 2$2,382 NZD
Retailer 11$3,377 NZD

32 data points across 15 retailers

11 retailers$352 NZD to $3,750 NZD

A
Cheapest Retailer
-
$352 NZD
$198 USD
A
Retailer 2
-
$398 NZD
$224 USD
View
Final sale: no returns
A
Retailer 3
-
$409 NZD
$230 USD
View
B+
Retailer 4
-
$757 NZD
$426 USD
View
A
Retailer 5
-
$889 NZD
£394 GBP
View
B+
Retailer 6
-
$1,408 NZD
$792 USD
View
B+
Retailer 7
-
$1,548 NZD
$871 USD
View
Retailer 8
-
$1,932 NZD
£856 GBP
View
Price last confirmed 7 days ago
B
Retailer 9
-
$2,382 NZD
$1,340 USD
View
B
Retailer 10
-
$3,377 NZD
$1,900 USD
View
Most Expensive
B
Jared
150062110 · Oct 28
$3,750 NZD
$2,110 USD
View
10 more retailers have this diamond
Prices start from $352 NZDSave up to $3,398 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 Round
$352 NZD