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Round|Lab Grown|IGI

1.65ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG12255703

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12255703

Diamond specifications and retailer prices

From $638 NZD
$359 USD
As of November 1, 2026
Save $2,777 NZD (81%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $5,670 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG12255703 or 12255703. Listed at 20 retailers as of November 1, 2026, with a 435% 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
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12255703
Dimensions7.59 × 7.63 × 4.65 mm
L/W Ratio1.01
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
7.59 mm7.63 mm1.65 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12255703
Side View
Table 59.0%Crown 35.5°Girdle: MED-UNDPavilion 40.9°Culet: NoneDepth 61.1%

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: $5,670 NZD|Low: $638 NZD|High: $5,670 NZD|Avg: $1,807 NZD
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
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Retailer 12
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Retailer 15
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Retailer 19
Retailer 20
November 2, 2026
Retailer 20$638 NZD
Retailer 18$741 NZD
Retailer 16$791 NZD
Retailer 3$793 NZD
Retailer 5$793 NZD
Retailer 17$793 NZD
Retailer 7$1,057 NZD
Retailer 8$1,271 NZD
Retailer 19$1,386 NZD
Retailer 10$1,406 NZD
Retailer 13$1,430 NZD
Retailer 12$1,545 NZD
Retailer 2$1,557 NZD
Retailer 14$1,671 NZD
Retailer 6$2,323 NZD
Retailer 9$2,463 NZD
Retailer 4$2,810 NZD
Retailer 11$3,082 NZD
Retailer 15$3,415 NZD
Do Amore Diamonds$5,670 NZD

17 data points across 20 retailers

20 retailers$638 NZD to $3,415 NZD

A
Cheapest Retailer
-
$638 NZD
$359 USD
A
Retailer 2
-
$741 NZD
$417 USD
View
B+
Retailer 3
-
$791 NZD
$445 USD
View
Retailer 4
-
$793 NZD
$446 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$793 NZD
$446 USD
View
A
Retailer 6
-
$793 NZD
$446 USD
View
B+
Retailer 7
-
$1,057 NZD
$595 USD
View
Retailer 8
-
$1,271 NZD
$715 USD
View
Price last confirmed 12 days ago
B+
Retailer 9
-
$1,386 NZD
$780 USD
View
B+
Retailer 10
-
$1,406 NZD
$791 USD
View
B+
Retailer 11
-
$1,430 NZD
£634 GBP
View
B+
Retailer 12
-
$1,545 NZD
$869 USD
View
B+
Retailer 13
-
$1,557 NZD
£690 GBP
View
B+
Retailer 14
-
$1,671 NZD
$940 USD
View
B
Retailer 15
-
$2,323 NZD
$1,307 USD
View
B
Retailer 16
-
$2,463 NZD
$1,386 USD
View
B
Retailer 17
-
$2,810 NZD
$1,581 USD
View
B
Retailer 18
-
$3,082 NZD
$1,734 USD
View
B
Retailer 19
-
$3,415 NZD
£1,513 GBP
View
Most Expensive
Do Amore Diamonds
27-7EBE39188 · Nov 2
$5,670 NZD
$3,190 USD
View
Price under review
19 more retailers have this diamond
Prices start from $638 NZDSave up to $2,777 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
$638 NZD