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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 $3,819 NZD
As of November 5, 2026
Save $3,126 NZD (45%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $12,039 NZD 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
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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: $12,039 NZD|Low: $3,668 NZD|High: $12,184 NZD|Avg: $6,621 NZD|-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$3,819 NZD
Retailer 6$4,156 NZD
Retailer 4$4,431 NZD
Retailer 8$5,621 NZD
Retailer 7$6,091 NZD
Retailer 5$6,925 NZD
Retailer 2$6,945 NZD
Retailer 9$9,916 NZD
MOH London$12,039 NZD

11 data points across 9 retailers

8 retailers$3,819 NZD to $6,945 NZD

B+
Cheapest Retailer
-
$3,819 NZD
B
Retailer 2
-
$4,156 NZD
View
Retailer 3
-
$4,431 NZD
View
Price last confirmed 26 days ago
B
Retailer 4
-
$4,431 NZD
View
B
Retailer 5
-
$6,091 NZD
View
B
Retailer 6
-
$6,925 NZD
View
B
Retailer 7
-
$6,945 NZD
View
Most Expensive
MOH London
LG451056609 · Oct 27
$12,039 NZD
£5,329 GBP
View
Price last confirmed 10 days ago
7 more retailers have this diamond
Prices start from $3,819 NZDSave up to $3,126 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.

B+
1.80ct Round
$3,819 NZD