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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 $504 AUD
$354 USD
As of October 27, 2026
Save $4,976 AUD (91%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: $5,480 AUD 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 $504 to $5,480, a $4,976 spread on the same certified stone. Brilliant Earth lists it at $5,480. 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

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: Oct 27
Current: $5,480 AUD|Low: $484 AUD|High: $5,494 AUD|Avg: $1,735 AUD|-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$504 AUD
Retailer 9$585 AUD
Retailer 6$625 AUD
Retailer 10$625 AUD
Retailer 12$648 AUD
Retailer 3$833 AUD
Retailer 14$840 AUD
Retailer 13$1,075 AUD
Retailer 16$1,085 AUD
Retailer 2$1,126 AUD
Retailer 11$1,452 AUD
Retailer 18$1,833 AUD
Retailer 8$2,010 AUD
Retailer 7$2,363 AUD
Retailer 15$2,446 AUD
Retailer 5$2,473 AUD
Retailer 17$3,829 AUD
Brilliant Earth$5,480 AUD

35 data points across 18 retailers

26 retailers$504 AUD to $5,480 AUD

A
Cheapest Retailer
-
$504 AUD
$354 USD
A
Retailer 2
-
$564 AUD
$396 USD
View
Final sale: no returns
A
Retailer 3
-
$585 AUD
$411 USD
View
A
Retailer 4
-
$625 AUD
$439 USD
View
A
Retailer 5
-
$625 AUD
$439 USD
View
A
Retailer 6
-
$648 AUD
£358 GBP
View
A
Retailer 7
-
$833 AUD
$585 USD
View
A
Retailer 8
-
$840 AUD
$590 USD
View
A
Retailer 9
-
$955 AUD
€639 EUR
View
A
Retailer 10
-
$1,003 AUD
$705 USD
View
A
Retailer 11
-
$1,075 AUD
ZAR 12,196 ZAR
View
A
Retailer 12
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$1,085 AUD
€726 EUR
View
A
Retailer 13
-
$1,126 AUD
£623 GBP
View
Retailer 14
-
$1,322 AUD
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
-
$1,452 AUD
View
B+
Retailer 16
-
$1,833 AUD
$1,288 USD
View
B+
Retailer 17
-
$1,971 AUD
$1,385 USD
View
B+
Retailer 18
-
$2,010 AUD
$1,412 USD
View
B+
Retailer 19
-
$2,069 AUD
$1,454 USD
View
B+
Retailer 20
-
$2,363 AUD
$1,660 USD
View
B+
Retailer 21
-
$2,400 AUD
$1,686 USD
View
B+
Retailer 22
-
$2,446 AUD
£1,353 GBP
View
Retailer 23
-
$2,473 AUD
View
Price last confirmed 21 days ago
B+
Retailer 24
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$2,635 AUD
$1,851 USD
View
Retailer 25
-
$3,829 AUD
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
$5,480 AUD
$3,850 USD
View
25 more retailers have this diamond
Prices start from $504 AUDSave up to $4,976 AUD

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
$504 AUD