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Radiant|Lab Grown|IGI

1.78ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • IGI LG780619896

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG780619896

Diamond specifications and retailer prices

From $355 NZD
$200 USD
As of November 1, 2026
Save $2,701 NZD (88%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $3,057 NZD at Do Amore Diamonds · As of November 2, 2026
View at Do Amore Diamonds

About this 1.78ct lab-grown radiant diamond

This 1.78ct lab-grown radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG780619896 or 780619896. Listed at 15 retailers as of November 1, 2026, with prices from $355 to $3,057, a $2,701 spread on the same certified stone. Do Amore Diamonds lists it at $3,057. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.6°
Pavilion angle37°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780619896
Dimensions8.34 × 6.27 × 4.19 mm
L/W Ratio1.33
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
8.34 mm6.27 mm1.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780619896
Side View
Table 66.0%Crown 37.6°Girdle: MED-STKPavilion 37°Culet: NoneDepth 66.9%

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: Nov 1
Current: $3,057 NZD|Low: $331 NZD|High: $3,181 NZD|Avg: $1,391 NZD|+4.2%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 8$355 NZD
Retailer 11$468 NZD
Retailer 7$539 NZD
Retailer 5$720 NZD
Retailer 10$874 NZD
Retailer 2$1,132 NZD
Retailer 9$1,410 NZD
Retailer 3$1,955 NZD
Retailer 4$2,034 NZD
Retailer 6$2,079 NZD
Do Amore Diamonds$3,057 NZD

27 data points across 11 retailers

15 retailers$355 NZD to $3,057 NZD

Retailer 1
-
$318 NZD
$179 USD
Price last confirmed 31 days ago
A
Retailer 2
-
$355 NZD
$200 USD
View
Final sale: no returns
Retailer 3
-
$373 NZD
$210 USD
View
Price last confirmed 36 days ago
A
Retailer 4
-
$468 NZD
$263 USD
View
B+
Retailer 5
-
$539 NZD
$303 USD
View
A
Retailer 6
-
$720 NZD
€386 EUR
View
A
Retailer 7
-
$874 NZD
$492 USD
View
A
Retailer 8
-
$1,132 NZD
$637 USD
View
B+
Retailer 9
-
$1,410 NZD
$793 USD
View
Retailer 10
-
$1,456 NZD
$819 USD
View
Price last confirmed 33 days ago
B+
Retailer 11
-
$1,768 NZD
$995 USD
View
B+
Retailer 12
-
$1,955 NZD
$1,100 USD
View
B+
Retailer 13
-
$2,034 NZD
£901 GBP
View
B
Retailer 14
-
$2,079 NZD
$1,170 USD
View
Most Expensive
B
Do Amore Diamonds
27-93711A3C9 · Nov 2
$3,057 NZD
$1,720 USD
View
14 more retailers have this diamond
Prices start from $355 NZDSave up to $2,701 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 Radiant
$355 NZD