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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 HK$2,778 HKD
$354 USD
As of October 27, 2026
Save HK$27,431 HKD (91%) vs most expensive(unlock to see where)
27 retailers carry this diamond
Most expensive: HK$30,209 HKD 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 27 retailers as of October 27, 2026, with prices from HK$2,778 to HK$30,209, a HK$27,431 spread on the same certified stone. Brilliant Earth lists it at HK$30,209. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: HK$30,209 HKD|Low: HK$2,668 HKD|High: HK$30,287 HKD|Avg: HK$9,562 HKD|-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 4HK$2,778 HKD
Retailer 9HK$3,225 HKD
Retailer 6HK$3,445 HKD
Retailer 10HK$3,445 HKD
Retailer 12HK$3,570 HKD
Retailer 3HK$4,590 HKD
Retailer 14HK$4,629 HKD
Retailer 13HK$5,923 HKD
Retailer 16HK$5,981 HKD
Retailer 2HK$6,204 HKD
Retailer 11HK$8,002 HKD
Retailer 18HK$10,106 HKD
Retailer 8HK$11,079 HKD
Retailer 7HK$13,025 HKD
Retailer 15HK$13,483 HKD
Retailer 5HK$13,633 HKD
Retailer 17HK$21,107 HKD
Brilliant EarthHK$30,209 HKD

35 data points across 18 retailers

27 retailersHK$2,778 HKD to HK$30,209 HKD

A
Cheapest Retailer
-
HK$2,778 HKD
$354 USD
A
Retailer 2
-
HK$3,107 HKD
$396 USD
View
Final sale: no returns
A
Retailer 3
-
HK$3,225 HKD
$411 USD
View
A
Retailer 4
-
HK$3,445 HKD
$439 USD
View
A
Retailer 5
-
HK$3,445 HKD
$439 USD
View
A
Retailer 6
-
HK$3,570 HKD
£358 GBP
View
A
Retailer 7
-
HK$4,590 HKD
$585 USD
View
A
Retailer 8
-
HK$4,629 HKD
$590 USD
View
A
Retailer 9
-
HK$5,265 HKD
€639 EUR
View
A
Retailer 10
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HK$5,532 HKD
$705 USD
View
A
Retailer 11
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HK$5,923 HKD
ZAR 12,196 ZAR
View
A
Retailer 12
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HK$5,981 HKD
€726 EUR
View
A
Retailer 13
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HK$6,204 HKD
£623 GBP
View
A
Retailer 14
-
HK$7,289 HKD
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
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HK$8,002 HKD
A$1,569 AUD
View
B+
Retailer 16
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HK$10,106 HKD
$1,288 USD
View
B+
Retailer 17
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HK$10,867 HKD
$1,385 USD
View
B+
Retailer 18
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HK$11,079 HKD
$1,412 USD
View
B+
Retailer 19
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HK$11,405 HKD
$1,454 USD
View
B+
Retailer 20
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HK$13,025 HKD
$1,660 USD
View
B+
Retailer 21
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HK$13,229 HKD
$1,686 USD
View
B+
Retailer 22
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HK$13,393 HKD
£1,344 GBP
View
Price last confirmed 30 days ago
B+
Retailer 23
-
HK$13,483 HKD
£1,353 GBP
View
B+
Retailer 24
-
HK$13,633 HKD
A$2,673 AUD
View
Price last confirmed 21 days ago
B+
Retailer 25
-
HK$14,524 HKD
$1,851 USD
View
B+
Retailer 26
-
HK$21,107 HKD
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
HK$30,209 HKD
$3,850 USD
View
26 more retailers have this diamond
Prices start from HK$2,778 HKDSave up to HK$27,431 HKD

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
HK$2,778 HKD