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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 £266 GBP
$354 USD
As of October 27, 2026
Save £2,625 GBP (91%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: £2,891 GBP 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 £266 to £2,891, a £2,625 spread on the same certified stone. Brilliant Earth lists it at £2,891. 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 27
Current: £2,891 GBP|Low: £255 GBP|High: £2,899 GBP|Avg: £915 GBP|-0.3%
Brilliant Earth
Retailer 2
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Retailer 18
October 29, 2026
Retailer 4£266 GBP
Retailer 9£309 GBP
Retailer 6£330 GBP
Retailer 10£330 GBP
Retailer 12£342 GBP
Retailer 3£439 GBP
Retailer 14£443 GBP
Retailer 13£567 GBP
Retailer 16£572 GBP
Retailer 2£594 GBP
Retailer 11£766 GBP
Retailer 18£967 GBP
Retailer 8£1,060 GBP
Retailer 7£1,247 GBP
Retailer 15£1,290 GBP
Retailer 5£1,305 GBP
Retailer 17£2,020 GBP
Brilliant Earth£2,891 GBP

35 data points across 18 retailers

26 retailers£266 GBP to £2,891 GBP

A
Cheapest Retailer
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£266 GBP
$354 USD
A
Retailer 2
-
£297 GBP
$396 USD
View
Final sale: no returns
A
Retailer 3
-
£309 GBP
$411 USD
View
A
Retailer 4
-
£330 GBP
$439 USD
View
A
Retailer 5
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£330 GBP
$439 USD
View
A
Retailer 6
-
£342 GBP
View
A
Retailer 7
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£439 GBP
$585 USD
View
A
Retailer 8
-
£443 GBP
$590 USD
View
A
Retailer 9
-
£504 GBP
€639 EUR
View
A
Retailer 10
-
£529 GBP
$705 USD
View
A
Retailer 11
-
£567 GBP
ZAR 12,196 ZAR
View
A
Retailer 12
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£572 GBP
€726 EUR
View
A
Retailer 13
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£594 GBP
View
Retailer 14
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£698 GBP
$929 USD
View
Price last confirmed 15 days ago
A
Retailer 15
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£766 GBP
A$1,569 AUD
View
B+
Retailer 16
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£967 GBP
$1,288 USD
View
B+
Retailer 17
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£1,040 GBP
$1,385 USD
View
B+
Retailer 18
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£1,060 GBP
$1,412 USD
View
B+
Retailer 19
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£1,092 GBP
$1,454 USD
View
B+
Retailer 20
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£1,247 GBP
$1,660 USD
View
B+
Retailer 21
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£1,266 GBP
$1,686 USD
View
B+
Retailer 22
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£1,290 GBP
View
Retailer 23
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£1,305 GBP
A$2,673 AUD
View
Price last confirmed 21 days ago
B+
Retailer 24
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£1,390 GBP
$1,851 USD
View
Retailer 25
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£2,020 GBP
$2,690 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
16509820A · Oct 28
£2,891 GBP
$3,850 USD
View
25 more retailers have this diamond
Prices start from £266 GBPSave up to £2,625 GBP

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
£266 GBP