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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 €317 EUR
$354 USD
As of October 30, 2026
Save €2,825 EUR (90%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: €3,142 EUR at Brilliant Earth · As of October 31, 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 30, 2026, with prices from €317 to €3,142, a €2,825 spread on the same certified stone. Brilliant Earth lists it at €3,142. 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
Color
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: €3,142 EUR|Low: €304 EUR|High: €3,446 EUR|Avg: €1,113 EUR|-6.4%
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
October 31, 2026
Retailer 4€317 EUR
Retailer 9€368 EUR
Retailer 6€393 EUR
Retailer 13€406 EUR
Retailer 11€524 EUR
Retailer 16€528 EUR
Retailer 15€676 EUR
Retailer 2€683 EUR
Retailer 10€708 EUR
Retailer 12€910 EUR
Retailer 14€913 EUR
Retailer 8€1,264 EUR
Retailer 7€1,486 EUR
Retailer 17€1,538 EUR
Retailer 5€1,555 EUR
Retailer 3€2,408 EUR
Brilliant Earth€3,142 EUR

35 data points across 17 retailers

26 retailers€317 EUR to €3,142 EUR

A
Cheapest Retailer
-
€317 EUR
$354 USD
A
Retailer 2
-
€354 EUR
$396 USD
View
Final sale: no returns
A
Retailer 3
-
€368 EUR
$411 USD
View
A
Retailer 4
-
€393 EUR
$439 USD
View
A
Retailer 5
-
€393 EUR
$439 USD
View
A
Retailer 6
-
€406 EUR
£357 GBP
View
A
Retailer 7
-
€524 EUR
$585 USD
View
A
Retailer 8
-
€528 EUR
$590 USD
View
A
Retailer 9
-
€602 EUR
View
A
Retailer 10
-
€631 EUR
$705 USD
View
A
Retailer 11
-
€676 EUR
ZAR 12,196 ZAR
View
A
Retailer 12
-
€683 EUR
View
A
Retailer 13
-
€708 EUR
£623 GBP
View
A
Retailer 14
-
€910 EUR
$1,017 USD
View
A
Retailer 15
-
€913 EUR
A$1,569 AUD
View
B+
Retailer 16
-
€1,153 EUR
$1,288 USD
View
B+
Retailer 17
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€1,240 EUR
$1,385 USD
View
B+
Retailer 18
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€1,264 EUR
$1,412 USD
View
B+
Retailer 19
-
€1,301 EUR
$1,454 USD
View
B+
Retailer 20
-
€1,486 EUR
$1,660 USD
View
B+
Retailer 21
-
€1,509 EUR
$1,686 USD
View
B+
Retailer 22
-
€1,538 EUR
£1,353 GBP
View
Retailer 23
-
€1,555 EUR
A$2,673 AUD
View
Price last confirmed 24 days ago
B+
Retailer 24
-
€1,657 EUR
$1,851 USD
View
Retailer 25
-
€2,408 EUR
$2,690 USD
View
Price last confirmed 11 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 31
€3,142 EUR
$3,510 USD
View
25 more retailers have this diamond
Prices start from €317 EURSave up to €2,825 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
€317 EUR