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Round|Lab Grown|IGI

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 $1,876 AUD
$1,318 USD
As of October 29, 2026
Save $2,202 AUD (54%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $4,079 AUD at NZ Jewellers · As of October 27, 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 27, 2026, with prices from $1,876 to $4,079, a $2,202 spread on the same certified stone. NZ Jewellers lists it at $4,079. 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: $4,079 AUD|Low: $1,801 AUD|High: $4,079 AUD|Avg: $2,733 AUD
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$1,876 AUD
Retailer 8$2,040 AUD
Retailer 5$2,101 AUD
Retailer 6$2,175 AUD
Retailer 9$2,175 AUD
Retailer 2$2,732 AUD
Retailer 10$3,008 AUD
Retailer 7$3,441 AUD
Retailer 4$4,056 AUD
NZ Jewellers$4,079 AUD

16 data points across 10 retailers

9 retailers$1,876 AUD to $4,079 AUD

B+
Cheapest Retailer
-
$1,876 AUD
$1,318 USD
B+
Retailer 2
-
$2,040 AUD
$1,433 USD
View
B+
Retailer 3
-
$2,101 AUD
$1,476 USD
View
Final sale: no returns
B+
Retailer 4
-
$2,175 AUD
$1,528 USD
View
Retailer 5
-
$2,175 AUD
$1,528 USD
View
Price last confirmed 17 days ago
Retailer 6
-
$2,732 AUD
£1,511 GBP
View
Price last confirmed 13 days ago
B
Retailer 7
-
$3,441 AUD
$2,417 USD
View
C
Retailer 8
-
$4,056 AUD
$2,849 USD
View
Most Expensive
C
NZ Jewellers
b1e1fae1-b9b4-4a22-b26b-031d79312aab · Oct 27
$4,079 AUD
$2,865 USD
View
8 more retailers have this diamond
Prices start from $1,876 AUDSave up to $2,202 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+
1.78ct Round
$1,876 AUD