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1.78ct I SI2 Round Lab Grown Diamond

GD • I/SI2 • IGI LG442067023

Shape and cutting style on the report: Round modified brilliant

Certificate IGI LG442067023

Diamond specifications and retailer prices

From $2,339 NZD
$1,318 USD
As of October 29, 2026
Save $2,745 NZD (54%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $5,083 NZD at NZ Jewellers · As of October 31, 2026
View at NZ Jewellers

About this 1.78ct lab-grown round diamond

This 1.78ct 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 standard cut grade and certified by IGI LG442067023 or 442067023. Listed at 9 retailers as of October 29, 2026, with prices from $2,339 to $5,083, a $2,745 spread on the same certified stone. NZ Jewellers lists it at $5,083. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.78
Carat
I
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle37.5°
Pavilion angle34.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG442067023
Dimensions8.15 × 8.20 × 3.10 mm
L/W Ratio1.01
Culet sizePointed
Top View
8.15 mm8.20 mm1.78 ctI / SI2
OriginLab Grown
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG442067023
Side View
Table 70.0%Crown 37.5°Girdle: THK-VTKPavilion 34.1°Culet: NoneDepth 37.9%

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: Oct 29
Current: $5,083 NZD|Low: $2,244 NZD|High: $5,083 NZD|Avg: $3,408 NZD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 17, 2026
Retailer 3$2,339 NZD
Retailer 8$2,543 NZD
Retailer 5$2,619 NZD
Retailer 6$2,711 NZD
Retailer 9$2,711 NZD
Retailer 2$3,406 NZD
Retailer 10$3,749 NZD
Retailer 7$4,288 NZD
Retailer 4$5,055 NZD
NZ Jewellers$5,083 NZD

15 data points across 10 retailers

9 retailers$2,339 NZD to $5,083 NZD

B+
Cheapest Retailer
-
$2,339 NZD
$1,318 USD
B+
Retailer 2
-
$2,543 NZD
$1,433 USD
View
B+
Retailer 3
-
$2,619 NZD
$1,476 USD
View
Final sale: no returns
B+
Retailer 4
-
$2,711 NZD
$1,528 USD
View
Retailer 5
-
$2,711 NZD
$1,528 USD
View
Price last confirmed 18 days ago
Retailer 6
-
$3,406 NZD
£1,511 GBP
View
Price last confirmed 13 days ago
B
Retailer 7
-
$4,288 NZD
$2,417 USD
View
C
Retailer 8
-
$5,055 NZD
$2,849 USD
View
Most Expensive
C
NZ Jewellers
b1e1fae1-b9b4-4a22-b26b-031d79312aab · Oct 31
$5,083 NZD
$2,865 USD
View
8 more retailers have this diamond
Prices start from $2,339 NZDSave up to $2,745 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+
1.78ct Round
$2,339 NZD