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Round|Lab Grown|IGI

1.66ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG407948757

Shape and cutting style on the report: Round brilliant

Certificate IGI LG407948757

Diamond specifications and retailer prices

From $1,501 AUD
As of November 5, 2026
Save $4,399 AUD (75%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $5,900 AUD at MOH London · As of November 3, 2026
View at MOH London

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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG407948757 or 407948757. Listed at 9 retailers as of November 3, 2026, with prices from $1,501 to $5,900, a $4,399 spread on the same certified stone. MOH London lists it at $5,900. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.1°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG407948757
Dimensions7.67 × 7.72 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
7.67 mm7.72 mm1.66 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG407948757
Side View
Table 59.0%Crown 32.1°GirdlePavilion 40.3°Culet: NoneDepth 59.2%

Caratlytics Score

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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 5
Current: $5,900 AUD|Low: $1,501 AUD|High: $5,979 AUD|Avg: $3,302 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 3, 2026
Retailer 3$1,501 AUD
Retailer 4$1,739 AUD
Retailer 2$1,994 AUD
Retailer 7$2,529 AUD
Retailer 5$2,774 AUD
Retailer 6$3,636 AUD
Retailer 8$4,979 AUD
MOH London$5,900 AUD

15 data points across 8 retailers

9 retailers$1,501 AUD to $5,900 AUD

A
Cheapest Retailer
-
$1,501 AUD
B+
Retailer 2
-
$1,632 AUD
View
Retailer 3
-
$1,739 AUD
View
Price last confirmed 25 days ago
B+
Retailer 4
-
$1,739 AUD
View
B+
Retailer 5
-
$1,994 AUD
View
B
Retailer 6
-
$2,774 AUD
View
B
Retailer 7
-
$3,262 AUD
View
B
Retailer 8
-
$3,636 AUD
View
Most Expensive
B
MOH London
LG407948757 · Nov 3
$5,900 AUD
£3,192 GBP
View
8 more retailers have this diamond
Prices start from $1,501 AUDSave up to $4,399 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
$1,501 AUD