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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 $495 CAD
$354 USD
As of October 27, 2026
Save $4,893 CAD (91%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: $5,388 CAD 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 27, 2026, with prices from $495 to $5,388, a $4,893 spread on the same certified stone. Brilliant Earth lists it at $5,388. 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 27
Current: $5,388 CAD|Low: $476 CAD|High: $5,402 CAD|Avg: $1,706 CAD|-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 29, 2026
Retailer 4$495 CAD
Retailer 9$575 CAD
Retailer 6$614 CAD
Retailer 10$614 CAD
Retailer 12$637 CAD
Retailer 3$819 CAD
Retailer 14$826 CAD
Retailer 13$1,057 CAD
Retailer 16$1,067 CAD
Retailer 2$1,107 CAD
Retailer 11$1,427 CAD
Retailer 18$1,803 CAD
Retailer 8$1,976 CAD
Retailer 7$2,323 CAD
Retailer 15$2,405 CAD
Retailer 5$2,432 CAD
Retailer 17$3,765 CAD
Brilliant Earth$5,388 CAD

35 data points across 18 retailers

26 retailers$495 CAD to $5,388 CAD

A
Cheapest Retailer
-
$495 CAD
$354 USD
A
Retailer 2
-
$554 CAD
$396 USD
View
Final sale: no returns
A
Retailer 3
-
$575 CAD
$411 USD
View
A
Retailer 4
-
$614 CAD
$439 USD
View
A
Retailer 5
-
$614 CAD
$439 USD
View
A
Retailer 6
-
$637 CAD
£358 GBP
View
A
Retailer 7
-
$819 CAD
$585 USD
View
A
Retailer 8
-
$826 CAD
$590 USD
View
A
Retailer 9
-
$939 CAD
€639 EUR
View
A
Retailer 10
-
$987 CAD
$705 USD
View
A
Retailer 11
-
$1,057 CAD
ZAR 12,196 ZAR
View
A
Retailer 12
-
$1,067 CAD
€726 EUR
View
A
Retailer 13
-
$1,107 CAD
£623 GBP
View
Retailer 14
-
$1,300 CAD
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
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$1,427 CAD
A$1,569 AUD
View
B+
Retailer 16
-
$1,803 CAD
$1,288 USD
View
B+
Retailer 17
-
$1,938 CAD
$1,385 USD
View
B+
Retailer 18
-
$1,976 CAD
$1,412 USD
View
B+
Retailer 19
-
$2,034 CAD
$1,454 USD
View
B+
Retailer 20
-
$2,323 CAD
$1,660 USD
View
B+
Retailer 21
-
$2,360 CAD
$1,686 USD
View
B+
Retailer 22
-
$2,405 CAD
£1,353 GBP
View
Retailer 23
-
$2,432 CAD
A$2,673 AUD
View
Price last confirmed 21 days ago
B+
Retailer 24
-
$2,591 CAD
$1,851 USD
View
Retailer 25
-
$3,765 CAD
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
$5,388 CAD
$3,850 USD
View
25 more retailers have this diamond
Prices start from $495 CADSave up to $4,893 CAD

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
$495 CAD