CaratHunter
Plans
Round|Lab Grown|IGI

1.80ct K SI2 Round Lab Grown Diamond

EX • K/SI2 • IGI LG451056609

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056609

Diamond specifications and retailer prices

From $3,067 AUD
As of November 5, 2026
Save $2,510 AUD (45%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $9,668 AUD at MOH London · As of October 27, 2026
View at MOH London

About this 1.8ct lab-grown round diamond

This 1.8ct lab-grown round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056609 or 451056609. Listed at 8 retailers as of November 4, 2026, with a 82% 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

1.80
Carat
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.4°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056609
Dimensions7.98 × 7.99 × 4.64 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
undefined
Top View
7.98 mm7.99 mm1.80 ctK / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056609
Side View
Table 60.0%Crown 31.4°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 58.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $9,668 AUD|Low: $2,946 AUD|High: $9,784 AUD|Avg: $5,317 AUD|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 27, 2026
Retailer 3$3,067 AUD
Retailer 6$3,337 AUD
Retailer 4$3,558 AUD
Retailer 8$4,514 AUD
Retailer 7$4,891 AUD
Retailer 5$5,561 AUD
Retailer 2$5,577 AUD
Retailer 9$7,962 AUD
MOH London$9,668 AUD

11 data points across 9 retailers

8 retailers$3,067 AUD to $5,577 AUD

B+
Cheapest Retailer
-
$3,067 AUD
B
Retailer 2
-
$3,337 AUD
View
Retailer 3
-
$3,558 AUD
View
Price last confirmed 26 days ago
B
Retailer 4
-
$3,558 AUD
View
B
Retailer 5
-
$4,891 AUD
View
B
Retailer 6
-
$5,561 AUD
View
B
Retailer 7
-
$5,577 AUD
View
Most Expensive
MOH London
LG451056609 · Oct 27
$9,668 AUD
£5,329 GBP
View
Price last confirmed 10 days ago
7 more retailers have this diamond
Prices start from $3,067 AUDSave up to $2,510 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.

B+
1.80ct Round
$3,067 AUD