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Round|Lab Grown|IGI

1.78ct E SI1 Round Lab Grown Diamond

ID • E/SI1

Diamond specifications and retailer prices

From $316 AUD
$222 USD
As of October 29, 2026
Save $941 AUD (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,257 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 5 retailers as of October 27, 2026, with prices from $316 to $1,257, a $941 spread on the same certified stone. NZ Jewellers lists it at $1,257. 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

1.78
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.78 × 7.82 × 0.00 mm
L/W Ratio1.01
Top View
7.78 mm7.82 mm1.78 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 58.0%CrownGirdle: MediumPavilionCulet: NoneDepth 61.1%

Caratlytics Score

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

Price History

Last verified: Oct 29
Current: $1,257 AUD|Low: $310 AUD|High: $1,287 AUD|Avg: $654 AUD|-2.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 30, 2026
Retailer 4$316 AUD
Retailer 5$366 AUD
Retailer 3$391 AUD
Retailer 6$400 AUD
Retailer 2$677 AUD
Retailer 7$1,063 AUD
NZ Jewellers$1,257 AUD

30 data points across 7 retailers

5 retailers$316 AUD to $1,257 AUD

A
Cheapest Retailer
-
$316 AUD
$222 USD
A
Retailer 2
-
$366 AUD
$257 USD
View
A
Retailer 3
-
$391 AUD
$275 USD
View
A
Retailer 4
-
$677 AUD
£374 GBP
View
Most Expensive
B
NZ Jewellers
cbee3b9f-6ee5-45a5-af39-b2f03e4aede7 · Oct 27
$1,257 AUD
$883 USD
View
4 more retailers have this diamond
Prices start from $316 AUDSave up to $941 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.

A
1.78ct Round
$316 AUD