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Round|Lab Grown|IGI

1.66ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG12361906

Shape and cutting style on the report: Round brilliant

Certificate IGI LG12361906

Diamond specifications and retailer prices

From $628 AUD
$440 USD
As of November 1, 2026
Save $1,748 AUD (74%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $3,953 AUD at Do Amore Diamonds · As of November 2, 2026
View at Do Amore Diamonds

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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG12361906 or 12361906. Listed at 14 retailers as of November 1, 2026, with a 278% 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

1.66
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG12361906
Dimensions7.59 × 7.56 × 4.73 mm
L/W Ratio1.00
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
7.59 mm7.56 mm1.66 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG12361906
Side View
Table 59.0%Crown 35.5°Girdle: THN-UNDPavilion 41.4°Culet: NoneDepth 62.3%

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: $3,953 AUD|Low: $390 AUD|High: $3,953 AUD|Avg: $1,437 AUD|+18.4%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 10$390 AUD
Retailer 11$431 AUD
Retailer 6$628 AUD
Retailer 7$896 AUD
Retailer 2$1,089 AUD
Retailer 9$1,245 AUD
Retailer 5$1,615 AUD
Retailer 3$1,989 AUD
Retailer 8$2,182 AUD
Retailer 4$2,376 AUD
Do Amore Diamonds$3,953 AUD

30 data points across 11 retailers

14 retailers$628 AUD to $2,376 AUD

Retailer 1
-
$347 AUD
$243 USD
Price last confirmed 41 days ago
Retailer 2
-
$402 AUD
$282 USD
View
Price last confirmed 41 days ago
Retailer 3
-
$425 AUD
$298 USD
View
Price last confirmed 42 days ago
A
Retailer 4
-
$628 AUD
$440 USD
View
B+
Retailer 5
-
$771 AUD
$540 USD
View
B+
Retailer 6
-
$896 AUD
$628 USD
View
B
Retailer 7
-
$1,089 AUD
£601 GBP
View
B
Retailer 8
-
$1,245 AUD
$873 USD
View
Retailer 9
-
$1,528 AUD
$1,071 USD
View
Price last confirmed 42 days ago
B
Retailer 10
-
$1,615 AUD
$1,132 USD
View
B
Retailer 11
-
$1,989 AUD
$1,394 USD
View
B
Retailer 12
-
$2,182 AUD
$1,529 USD
View
C
Retailer 13
-
$2,376 AUD
£1,311 GBP
View
Most Expensive
Do Amore Diamonds
27-08AD635EE · Nov 2
$3,953 AUD
$2,770 USD
View
Price under review
13 more retailers have this diamond
Prices start from $628 AUDSave up to $1,748 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
1.66ct Round
$628 AUD