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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 $285 SGD
$222 USD
As of October 29, 2026
Save $847 SGD (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,132 SGD 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 $285 to $1,132, a $847 spread on the same certified stone. NZ Jewellers lists it at $1,132. 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: $1,132 SGD|Low: $279 SGD|High: $1,159 SGD|Avg: $592 SGD|-2.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 29, 2026
Retailer 4$285 SGD
Retailer 5$329 SGD
Retailer 3$352 SGD
Retailer 6$360 SGD
Retailer 2$611 SGD
Retailer 7$957 SGD
NZ Jewellers$1,132 SGD

30 data points across 7 retailers

5 retailers$285 SGD to $1,132 SGD

A
Cheapest Retailer
-
$285 SGD
$222 USD
A
Retailer 2
-
$329 SGD
$257 USD
View
A
Retailer 3
-
$352 SGD
$275 USD
View
A
Retailer 4
-
$611 SGD
£375 GBP
View
Most Expensive
B
NZ Jewellers
cbee3b9f-6ee5-45a5-af39-b2f03e4aede7 · Oct 27
$1,132 SGD
$883 USD
View
4 more retailers have this diamond
Prices start from $285 SGDSave up to $847 SGD

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
$285 SGD