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1.78ct E SI2 Round Lab Grown Diamond

VG • E/SI2 • IGI LG786624855

Shape and cutting style on the report: Round brilliant

Certificate IGI LG786624855

Diamond specifications and retailer prices

From $402 NZD
$226 USD
As of October 29, 2026
Save $2,322 NZD (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,724 NZD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

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 SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI LG786624855 or 786624855. Listed at 13 retailers as of October 29, 2026, with prices from $402 to $2,724, a $2,322 spread on the same certified stone. Brilliant Earth lists it at $2,724. 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
E
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786624855
Dimensions7.74 × 7.62 × 4.78 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.74 mm7.62 mm1.78 ctE / SI2
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786624855
Side View
Table 59.0%Crown 37°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 62.1%

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: $2,724 NZD|Low: $385 NZD|High: $2,724 NZD|Avg: $1,127 NZD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9$402 NZD
Retailer 11$450 NZD
Retailer 3$499 NZD
Retailer 6$824 NZD
Retailer 12$846 NZD
Retailer 2$924 NZD
Retailer 10$967 NZD
Retailer 4$1,214 NZD
Retailer 8$1,351 NZD
Retailer 7$1,442 NZD
Retailer 5$2,006 NZD
Brilliant Earth$2,724 NZD

29 data points across 12 retailers

13 retailers$402 NZD to $2,724 NZD

A
Cheapest Retailer
-
$402 NZD
$226 USD
A
Retailer 2
-
$450 NZD
$253 USD
View
Final sale: no returns
A
Retailer 3
-
$499 NZD
$280 USD
View
A
Retailer 4
-
$824 NZD
€441 EUR
View
B+
Retailer 5
-
$846 NZD
$475 USD
View
B+
Retailer 6
-
$924 NZD
£409 GBP
View
B+
Retailer 7
-
$967 NZD
$543 USD
View
B+
Retailer 8
-
$1,214 NZD
$682 USD
View
B
Retailer 9
-
$1,351 NZD
$759 USD
View
B
Retailer 10
-
$1,442 NZD
$810 USD
View
B
Retailer 11
-
$1,487 NZD
$835 USD
View
Price last confirmed 44 days ago
B
Retailer 12
-
$2,006 NZD
£887 GBP
View
Most Expensive
B
Brilliant Earth
19892742A · Oct 29
$2,724 NZD
$1,530 USD
View
12 more retailers have this diamond
Prices start from $402 NZDSave up to $2,322 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.

A
1.78ct Round
$402 NZD