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Radiant|Lab Grown|IGI

1.78ct E IF Radiant Lab Grown Diamond

ID • E/IF • IGI LG620418140

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

Certificate IGI LG620418140

Diamond specifications and retailer prices

From €318 EUR
$354 USD
As of October 30, 2026
Save €3,141 EUR (91%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: €3,459 EUR at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG620418140 or 620418140. Listed at 26 retailers as of October 28, 2026, with prices from €318 to €3,459, a €3,141 spread on the same certified stone. Brilliant Earth lists it at €3,459. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.4°
Pavilion angle33.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620418140
Dimensions8.17 × 6.07 × 4.09 mm
L/W Ratio1.35
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
8.17 mm6.07 mm1.78 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620418140
Side View
Table 64.0%Crown 44.4°Girdle: MediumPavilion 33.8°Culet: NoneDepth 67.4%

Caratlytics Score

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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 30
Current: €3,459 EUR|Low: €305 EUR|High: €3,468 EUR|Avg: €1,101 EUR|-0.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
October 30, 2026
Retailer 4€318 EUR
Retailer 9€369 EUR
Retailer 6€394 EUR
Retailer 10€394 EUR
Retailer 2€408 EUR
Retailer 3€526 EUR
Retailer 14€530 EUR
Retailer 13€678 EUR
Retailer 16€685 EUR
Retailer 11€710 EUR
Retailer 12€916 EUR
Retailer 18€1,157 EUR
Retailer 8€1,269 EUR
Retailer 7€1,491 EUR
Retailer 15€1,544 EUR
Retailer 5€1,561 EUR
Retailer 17€2,417 EUR
Brilliant Earth€3,459 EUR

36 data points across 18 retailers

26 retailers€318 EUR to €3,459 EUR

A
Cheapest Retailer
-
€318 EUR
$354 USD
A
Retailer 2
-
€356 EUR
$396 USD
View
Final sale: no returns
A
Retailer 3
-
€369 EUR
$411 USD
View
A
Retailer 4
-
€394 EUR
$439 USD
View
A
Retailer 5
-
€394 EUR
$439 USD
View
A
Retailer 6
-
€408 EUR
£357 GBP
View
A
Retailer 7
-
€526 EUR
$585 USD
View
A
Retailer 8
-
€530 EUR
$590 USD
View
A
Retailer 9
-
€603 EUR
View
A
Retailer 10
-
€633 EUR
$705 USD
View
A
Retailer 11
-
€678 EUR
ZAR 12,196 ZAR
View
A
Retailer 12
-
€685 EUR
View
A
Retailer 13
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€710 EUR
£623 GBP
View
Retailer 14
-
€835 EUR
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
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€916 EUR
A$1,569 AUD
View
B+
Retailer 16
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€1,157 EUR
$1,288 USD
View
B+
Retailer 17
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€1,244 EUR
$1,385 USD
View
B+
Retailer 18
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€1,269 EUR
$1,412 USD
View
B+
Retailer 19
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€1,306 EUR
$1,454 USD
View
B+
Retailer 20
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€1,491 EUR
$1,660 USD
View
B+
Retailer 21
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€1,515 EUR
$1,686 USD
View
B+
Retailer 22
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€1,544 EUR
£1,353 GBP
View
Retailer 23
-
€1,561 EUR
A$2,673 AUD
View
Price last confirmed 22 days ago
B+
Retailer 24
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€1,663 EUR
$1,851 USD
View
Retailer 25
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€2,417 EUR
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
€3,459 EUR
$3,850 USD
View
25 more retailers have this diamond
Prices start from €318 EURSave up to €3,141 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
€318 EUR