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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 $525 AUD
$368 USD
As of November 1, 2026
Save $2,007 AUD (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $4,666 AUD 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: $4,666 AUD|Low: $525 AUD|High: $4,666 AUD|Avg: $1,502 AUD
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$525 AUD
Retailer 3$599 AUD
Retailer 18$609 AUD
Retailer 5$652 AUD
Retailer 16$652 AUD
Retailer 15$668 AUD
Retailer 7$863 AUD
Retailer 8$1,077 AUD
Retailer 19$1,129 AUD
Retailer 2$1,179 AUD
Retailer 10$1,191 AUD
Retailer 12$1,282 AUD
Retailer 13$1,321 AUD
Retailer 6$1,911 AUD
Retailer 9$2,072 AUD
Retailer 14$2,226 AUD
Retailer 4$2,313 AUD
Retailer 11$2,532 AUD
Retailer 17$2,814 AUD
Do Amore Diamonds$4,666 AUD

18 data points across 20 retailers

20 retailers$525 AUD to $2,532 AUD

A
Cheapest Retailer
-
$525 AUD
$368 USD
A
Retailer 2
-
$599 AUD
$420 USD
View
A
Retailer 3
-
$609 AUD
$427 USD
View
Retailer 4
-
$652 AUD
$457 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$652 AUD
$457 USD
View
B+
Retailer 6
-
$668 AUD
$468 USD
View
B+
Retailer 7
-
$863 AUD
$605 USD
View
Retailer 8
-
$1,077 AUD
$755 USD
View
Price last confirmed 12 days ago
B+
Retailer 9
-
$1,129 AUD
$791 USD
View
B
Retailer 10
-
$1,179 AUD
£651 GBP
View
Retailer 11
-
$1,191 AUD
$835 USD
View
Price last confirmed 7 days ago
B+
Retailer 12
-
$1,282 AUD
$898 USD
View
B+
Retailer 13
-
$1,321 AUD
£729 GBP
View
B
Retailer 14
-
$1,911 AUD
$1,339 USD
View
B
Retailer 15
-
$2,072 AUD
$1,452 USD
View
B
Retailer 16
-
$2,226 AUD
$1,560 USD
View
B
Retailer 17
-
$2,313 AUD
$1,621 USD
View
B
Retailer 18
-
$2,532 AUD
$1,775 USD
View
Retailer 19
-
$2,814 AUD
£1,553 GBP
View
Price last confirmed 8 days ago
Most Expensive
Do Amore Diamonds
27-EC6B3E9CB · Nov 2
$4,666 AUD
$3,270 USD
View
Price under review
19 more retailers have this diamond
Prices start from $525 AUDSave up to $2,007 AUD

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
$525 AUD