Round|Lab Grown|IGI

1.78ct E SI1 Round Lab Grown Diamond

ID • E/SI1

Diamond specifications and retailer prices

From €199 EUR
$222 USD
As of October 29, 2026
Save €592 EUR (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: €790 EUR 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 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 29, 2026, with prices from €199 to €790, a €592 spread on the same certified stone. NZ Jewellers lists it at €790. 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
Color
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: €790 EUR|Low: €195 EUR|High: €809 EUR|Avg: €410 EUR|-2.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 4€199 EUR
Retailer 5€230 EUR
Retailer 3€246 EUR
Retailer 6€252 EUR
Retailer 2€424 EUR
Retailer 7€669 EUR
NZ Jewellers€790 EUR

30 data points across 7 retailers

5 retailers€199 EUR to €790 EUR

A
Cheapest Retailer
-
€199 EUR
$222 USD
A
Retailer 2
-
€230 EUR
$257 USD
View
A
Retailer 3
-
€246 EUR
$275 USD
View
A
Retailer 4
-
€424 EUR
£373 GBP
View
Most Expensive
B
NZ Jewellers
cbee3b9f-6ee5-45a5-af39-b2f03e4aede7 · Oct 31
€790 EUR
$883 USD
View
4 more retailers have this diamond
Prices start from €199 EURSave up to €592 EUR

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
€199 EUR