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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 $630 NZD
$354 USD
As of October 30, 2026
Save $6,225 NZD (91%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: $6,855 NZD 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 $630 to $6,855, a $6,225 spread on the same certified stone. Brilliant Earth lists it at $6,855. 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: $6,855 NZD|Low: $605 NZD|High: $6,873 NZD|Avg: $2,182 NZD|-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$630 NZD
Retailer 9$732 NZD
Retailer 6$782 NZD
Retailer 10$782 NZD
Retailer 2$808 NZD
Retailer 3$1,042 NZD
Retailer 14$1,050 NZD
Retailer 13$1,344 NZD
Retailer 16$1,357 NZD
Retailer 11$1,408 NZD
Retailer 12$1,816 NZD
Retailer 18$2,293 NZD
Retailer 8$2,514 NZD
Retailer 7$2,956 NZD
Retailer 15$3,059 NZD
Retailer 5$3,094 NZD
Retailer 17$4,790 NZD
Brilliant Earth$6,855 NZD

36 data points across 18 retailers

26 retailers$630 NZD to $6,855 NZD

A
Cheapest Retailer
-
$630 NZD
$354 USD
A
Retailer 2
-
$705 NZD
$396 USD
View
Final sale: no returns
A
Retailer 3
-
$732 NZD
$411 USD
View
A
Retailer 4
-
$782 NZD
$439 USD
View
A
Retailer 5
-
$782 NZD
$439 USD
View
A
Retailer 6
-
$808 NZD
£357 GBP
View
A
Retailer 7
-
$1,042 NZD
$585 USD
View
A
Retailer 8
-
$1,050 NZD
$590 USD
View
A
Retailer 9
-
$1,195 NZD
€639 EUR
View
A
Retailer 10
-
$1,255 NZD
$705 USD
View
A
Retailer 11
-
$1,344 NZD
ZAR 12,196 ZAR
View
A
Retailer 12
-
$1,357 NZD
€726 EUR
View
A
Retailer 13
-
$1,408 NZD
£623 GBP
View
Retailer 14
-
$1,654 NZD
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
-
$1,816 NZD
A$1,569 AUD
View
B+
Retailer 16
-
$2,293 NZD
$1,288 USD
View
B+
Retailer 17
-
$2,466 NZD
$1,385 USD
View
B+
Retailer 18
-
$2,514 NZD
$1,412 USD
View
B+
Retailer 19
-
$2,588 NZD
$1,454 USD
View
B+
Retailer 20
-
$2,956 NZD
$1,660 USD
View
B+
Retailer 21
-
$3,002 NZD
$1,686 USD
View
B+
Retailer 22
-
$3,059 NZD
£1,353 GBP
View
Retailer 23
-
$3,094 NZD
A$2,673 AUD
View
Price last confirmed 22 days ago
B+
Retailer 24
-
$3,296 NZD
$1,851 USD
View
Retailer 25
-
$4,790 NZD
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
$6,855 NZD
$3,850 USD
View
25 more retailers have this diamond
Prices start from $630 NZDSave up to $6,225 NZD

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
$630 NZD