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Round|Lab Grown|IGI

1.65ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG12378006

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12378006

Diamond specifications and retailer prices

From $654 NZD
$368 USD
As of November 1, 2026
Save $2,500 NZD (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $5,812 NZD at Do Amore Diamonds · As of November 2, 2026
View at Do Amore Diamonds

About this 1.65ct lab-grown round diamond

This 1.65ct 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 LG12378006 or 12378006. Listed at 20 retailers as of October 31, 2026, with a 382% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.65
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12378006
Dimensions7.64 × 7.67 × 4.62 mm
L/W Ratio1.00
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
7.64 mm7.67 mm1.65 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12378006
Side View
Table 60.0%Crown 34°Girdle: MED-UNDPavilion 41.1°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: $5,812 NZD|Low: $654 NZD|High: $5,812 NZD|Avg: $1,871 NZD
Do Amore Diamonds
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
Retailer 18
Retailer 19
Retailer 20
November 3, 2026
Retailer 20$654 NZD
Retailer 3$746 NZD
Retailer 18$759 NZD
Retailer 5$812 NZD
Retailer 16$812 NZD
Retailer 15$832 NZD
Retailer 7$1,075 NZD
Retailer 8$1,342 NZD
Retailer 19$1,406 NZD
Retailer 2$1,469 NZD
Retailer 10$1,484 NZD
Retailer 12$1,597 NZD
Retailer 13$1,646 NZD
Retailer 6$2,380 NZD
Retailer 9$2,581 NZD
Retailer 14$2,773 NZD
Retailer 4$2,881 NZD
Retailer 11$3,154 NZD
Retailer 17$3,505 NZD
Do Amore Diamonds$5,812 NZD

18 data points across 20 retailers

20 retailers$654 NZD to $3,154 NZD

A
Cheapest Retailer
-
$654 NZD
$368 USD
A
Retailer 2
-
$746 NZD
$420 USD
View
A
Retailer 3
-
$759 NZD
$427 USD
View
Retailer 4
-
$812 NZD
$457 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$812 NZD
$457 USD
View
B+
Retailer 6
-
$832 NZD
$468 USD
View
B+
Retailer 7
-
$1,075 NZD
$605 USD
View
Retailer 8
-
$1,342 NZD
$755 USD
View
Price last confirmed 12 days ago
B+
Retailer 9
-
$1,406 NZD
$791 USD
View
B
Retailer 10
-
$1,469 NZD
£651 GBP
View
Retailer 11
-
$1,484 NZD
$835 USD
View
Price last confirmed 7 days ago
B+
Retailer 12
-
$1,597 NZD
$898 USD
View
B+
Retailer 13
-
$1,646 NZD
£729 GBP
View
B
Retailer 14
-
$2,380 NZD
$1,339 USD
View
B
Retailer 15
-
$2,581 NZD
$1,452 USD
View
B
Retailer 16
-
$2,773 NZD
$1,560 USD
View
B
Retailer 17
-
$2,881 NZD
$1,621 USD
View
B
Retailer 18
-
$3,154 NZD
$1,775 USD
View
Retailer 19
-
$3,505 NZD
£1,553 GBP
View
Price last confirmed 8 days ago
Most Expensive
Do Amore Diamonds
27-EC6B3E9CB · Nov 2
$5,812 NZD
$3,270 USD
View
Price under review
19 more retailers have this diamond
Prices start from $654 NZDSave up to $2,500 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
1.65ct Round
$654 NZD