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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 €178 EUR
$200 USD
As of November 1, 2026
Save €1,355 EUR (88%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: €1,534 EUR 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 €178 to €1,534, a €1,355 spread on the same certified stone. Do Amore Diamonds lists it at €1,534. 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: €1,534 EUR|Low: €166 EUR|High: €1,596 EUR|Avg: €698 EUR|+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€178 EUR
Retailer 11€235 EUR
Retailer 7€270 EUR
Retailer 5€361 EUR
Retailer 10€439 EUR
Retailer 2€568 EUR
Retailer 9€707 EUR
Retailer 3€981 EUR
Retailer 4€1,020 EUR
Retailer 6€1,043 EUR
Do Amore Diamonds€1,534 EUR

26 data points across 11 retailers

15 retailers€178 EUR to €1,534 EUR

Retailer 1
-
€160 EUR
$179 USD
Price last confirmed 31 days ago
A
Retailer 2
-
€178 EUR
$200 USD
View
Final sale: no returns
Retailer 3
-
€187 EUR
$210 USD
View
Price last confirmed 36 days ago
A
Retailer 4
-
€235 EUR
$263 USD
View
B+
Retailer 5
-
€270 EUR
$303 USD
View
A
Retailer 6
-
€361 EUR
View
A
Retailer 7
-
€439 EUR
$492 USD
View
A
Retailer 8
-
€568 EUR
$637 USD
View
B+
Retailer 9
-
€707 EUR
$793 USD
View
Retailer 10
-
€730 EUR
$819 USD
View
Price last confirmed 33 days ago
B+
Retailer 11
-
€887 EUR
$995 USD
View
B+
Retailer 12
-
€981 EUR
$1,100 USD
View
B+
Retailer 13
-
€1,020 EUR
£901 GBP
View
B
Retailer 14
-
€1,043 EUR
$1,170 USD
View
Most Expensive
B
Do Amore Diamonds
27-93711A3C9 · Nov 2
€1,534 EUR
$1,720 USD
View
14 more retailers have this diamond
Prices start from €178 EURSave up to €1,355 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 Radiant
€178 EUR