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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 $471 SGD
$368 USD
As of November 1, 2026
Save $1,799 SGD (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $4,182 SGD 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $4,182 SGD|Low: $471 SGD|High: $4,182 SGD|Avg: $1,346 SGD
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$471 SGD
Retailer 3$537 SGD
Retailer 18$546 SGD
Retailer 5$584 SGD
Retailer 16$584 SGD
Retailer 15$599 SGD
Retailer 7$774 SGD
Retailer 8$966 SGD
Retailer 19$1,012 SGD
Retailer 2$1,057 SGD
Retailer 10$1,068 SGD
Retailer 12$1,149 SGD
Retailer 13$1,184 SGD
Retailer 6$1,712 SGD
Retailer 9$1,857 SGD
Retailer 14$1,995 SGD
Retailer 4$2,073 SGD
Retailer 11$2,270 SGD
Retailer 17$2,522 SGD
Do Amore Diamonds$4,182 SGD

18 data points across 20 retailers

20 retailers$471 SGD to $2,270 SGD

A
Cheapest Retailer
-
$471 SGD
$368 USD
A
Retailer 2
-
$537 SGD
$420 USD
View
A
Retailer 3
-
$546 SGD
$427 USD
View
Retailer 4
-
$584 SGD
$457 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$584 SGD
$457 USD
View
B+
Retailer 6
-
$599 SGD
$468 USD
View
B+
Retailer 7
-
$774 SGD
$605 USD
View
Retailer 8
-
$966 SGD
$755 USD
View
Price last confirmed 12 days ago
B+
Retailer 9
-
$1,012 SGD
$791 USD
View
B
Retailer 10
-
$1,057 SGD
£651 GBP
View
Retailer 11
-
$1,068 SGD
$835 USD
View
Price last confirmed 7 days ago
B+
Retailer 12
-
$1,149 SGD
$898 USD
View
B+
Retailer 13
-
$1,184 SGD
£729 GBP
View
B
Retailer 14
-
$1,712 SGD
$1,339 USD
View
B
Retailer 15
-
$1,857 SGD
$1,452 USD
View
B
Retailer 16
-
$1,995 SGD
$1,560 USD
View
B
Retailer 17
-
$2,073 SGD
$1,621 USD
View
B
Retailer 18
-
$2,270 SGD
$1,775 USD
View
Retailer 19
-
$2,522 SGD
£1,553 GBP
View
Price last confirmed 8 days ago
Most Expensive
Do Amore Diamonds
27-EC6B3E9CB · Nov 2
$4,182 SGD
$3,270 USD
View
Price under review
19 more retailers have this diamond
Prices start from $471 SGDSave up to $1,799 SGD

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
$471 SGD