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Round|Lab Grown|IGI

1.73ct I SI2 Round Lab Grown Diamond

EX • I/SI2 • IGI LG451057633

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057633

Diamond specifications and retailer prices

From $1,703 NZD
$960 USD
As of October 30, 2026
Save $3,742 NZD (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $8,342 NZD at MOH London · As of October 21, 2026
View at MOH London

About this 1.73ct lab-grown round diamond

This 1.73ct lab-grown round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057633 or 451057633. Listed at 10 retailers as of October 30, 2026, with a 220% 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

1.73
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057633
Dimensions7.67 × 7.63 × 4.72 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.67 mm7.63 mm1.73 ctI / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057633
Side View
Table 60.0%Crown 36.3°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $8,342 NZD|Low: $1,703 NZD|High: $8,410 NZD|Avg: $4,156 NZD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 2$1,703 NZD
Retailer 5$2,505 NZD
Retailer 9$2,725 NZD
Retailer 8$2,805 NZD
Retailer 6$2,906 NZD
Retailer 3$3,234 NZD
Retailer 12$3,976 NZD
Retailer 7$4,585 NZD
Retailer 11$5,273 NZD
Retailer 10$5,445 NZD
Retailer 4$6,505 NZD
MOH London$8,342 NZD

15 data points across 12 retailers

10 retailers$1,703 NZD to $5,445 NZD

A
Cheapest Retailer
-
$1,703 NZD
$960 USD
B+
Retailer 2
-
$2,505 NZD
$1,412 USD
View
B+
Retailer 3
-
$2,725 NZD
$1,536 USD
View
B+
Retailer 4
-
$2,805 NZD
$1,581 USD
View
Final sale: no returns
B+
Retailer 5
-
$2,906 NZD
$1,638 USD
View
Retailer 6
-
$2,906 NZD
$1,638 USD
View
Price last confirmed 18 days ago
B
Retailer 7
-
$4,585 NZD
$2,584 USD
View
B
Retailer 8
-
$5,273 NZD
$2,972 USD
View
B
Retailer 9
-
$5,445 NZD
$3,069 USD
View
Most Expensive
MOH London
LG451057633 · Oct 21
$8,342 NZD
£3,702 GBP
View
Price last confirmed 10 days ago
9 more retailers have this diamond
Prices start from $1,703 NZDSave up to $3,742 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.

A
1.73ct Round
$1,703 NZD