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Radiant|Lab Grown|IGI

2.57ct F IF Radiant Lab Grown Diamond

EX • F/IF • IGI LG840652908

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG840652908

Diamond specifications and retailer prices

From £374 GBP
$501 USD
As of November 1, 2026
Save £2,596 GBP (87%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,112 GBP at Rare Carat · As of October 21, 2026
View at Rare Carat

About this 2.57ct lab-grown radiant diamond

This 2.57ct lab-grown radiant sits in the two to three carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG840652908 or 840652908. Listed at 16 retailers as of November 1, 2026, with a 694% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

2.57
Carat
F
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.3°
Pavilion angle36.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840652908
Dimensions8.94 × 7.22 × 4.75 mm
L/W Ratio1.24
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
8.94 mm7.22 mm2.57 ctF / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840652908
Side View
Table 64.0%Crown 40.3°Girdle: MED-STKPavilion 36.8°Culet: NoneDepth 65.8%

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: Nov 1
Current: £3,112 GBP|Low: £374 GBP|High: £3,112 GBP|Avg: £1,354 GBP
Rare Carat
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
November 2, 2026
Retailer 3£374 GBP
Retailer 2£484 GBP
Retailer 4£550 GBP
Retailer 12£556 GBP
Retailer 9£761 GBP
Retailer 14£1,016 GBP
Retailer 13£1,051 GBP
Retailer 15£1,104 GBP
Retailer 7£1,172 GBP
Retailer 5£1,552 GBP
Retailer 8£1,578 GBP
Retailer 6£1,602 GBP
Retailer 10£1,911 GBP
Retailer 11£2,337 GBP
Retailer 16£2,970 GBP
Rare Carat£3,112 GBP

13 data points across 16 retailers

16 retailers£374 GBP to £2,970 GBP

A
Cheapest Retailer
-
£374 GBP
$501 USD
Final sale: no returns
A
Retailer 2
-
£484 GBP
View
B+
Retailer 3
-
£550 GBP
$737 USD
View
A
Retailer 4
-
£556 GBP
$745 USD
View
A
Retailer 5
-
£761 GBP
View
A
Retailer 6
-
£1,016 GBP
A$2,094 AUD
View
A
Retailer 7
-
£1,051 GBP
$1,408 USD
View
A
Retailer 8
-
£1,104 GBP
ZAR 23,904 ZAR
View
A
Retailer 9
-
£1,172 GBP
$1,570 USD
View
A
Retailer 10
-
£1,552 GBP
$2,079 USD
View
A
Retailer 11
-
£1,578 GBP
$2,115 USD
View
A
Retailer 12
-
£1,602 GBP
SGD 2,900 SGD
View
B+
Retailer 13
-
£1,911 GBP
View
B+
Retailer 14
-
£2,337 GBP
A$4,818 AUD
View
B
Retailer 15
-
£2,970 GBP
$3,980 USD
View
Most Expensive
Rare Carat
LA2653 · Oct 21
£3,112 GBP
$4,170 USD
View
Price last confirmed 11 days ago
15 more retailers have this diamond
Prices start from £374 GBPSave up to £2,596 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
2.57ct Radiant
£374 GBP