Round|Lab Grown|IGI

1.25ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG811647377

Shape and cutting style on the report: Round brilliant

Certificate IGI LG811647377

Diamond specifications and retailer prices

From £348 GBP
$467 USD
As of November 1, 2026
Save £1,236 GBP (78%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £1,908 GBP at Brilliant Earth · As of October 14, 2026
View at Brilliant Earth

About this 1.25ct lab-grown round diamond

This 1.25ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG811647377 or 811647377. Listed at 22 retailers as of November 1, 2026, with a 355% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.25
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811647377
Dimensions6.98 × 6.95 × 4.20 mm
L/W Ratio1.00
Girdle conditionFaceted
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
6.98 mm6.95 mm1.25 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811647377
Side View
Table 59.0%Crown 33.3°Girdle: MediumPavilion 40.7°Culet: NoneDepth 60.3%

Caratlytics Score

How it works →
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: Nov 1
Current: £1,908 GBP|Low: £334 GBP|High: £1,960 GBP|Avg: £903 GBP|-2.7%
Brilliant Earth
Retailer 2
Retailer 3
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Retailer 12
Retailer 13
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Retailer 19
Retailer 20
November 3, 2026
Retailer 4£348 GBP
Retailer 12£389 GBP
Retailer 10£390 GBP
Retailer 8£431 GBP
Retailer 19£537 GBP
Retailer 17£663 GBP
Retailer 5£673 GBP
Retailer 20£674 GBP
Retailer 13£684 GBP
Retailer 2£713 GBP
Retailer 14£744 GBP
Retailer 6£970 GBP
Retailer 16£1,051 GBP
Retailer 7£1,095 GBP
Retailer 18£1,160 GBP
Retailer 9£1,369 GBP
Retailer 11£1,386 GBP
Retailer 3£1,412 GBP
Retailer 15£1,584 GBP
Brilliant Earth£1,908 GBP

41 data points across 20 retailers

22 retailers£348 GBP to £1,584 GBP

A
Cheapest Retailer
-
£348 GBP
$467 USD
A
Retailer 2
-
£389 GBP
$522 USD
View
Final sale: no returns
A
Retailer 3
-
£390 GBP
$523 USD
View
A
Retailer 4
-
£431 GBP
$579 USD
View
Retailer 5
-
£431 GBP
$579 USD
View
Price last confirmed 21 days ago
A
Retailer 6
-
£537 GBP
$720 USD
View
B+
Retailer 7
-
£616 GBP
$826 USD
View
B+
Retailer 8
-
£663 GBP
A$1,368 AUD
View
B+
Retailer 9
-
£674 GBP
$904 USD
View
B+
Retailer 10
-
£684 GBP
View
B+
Retailer 11
-
£713 GBP
View
B+
Retailer 12
-
£744 GBP
ZAR 16,124 ZAR
View
Retailer 13
-
£970 GBP
A$2,002 AUD
View
Price last confirmed 26 days ago
B
Retailer 14
-
£1,051 GBP
A$2,170 AUD
View
Retailer 15
-
£1,095 GBP
$1,470 USD
View
Price last confirmed 27 days ago
B
Retailer 16
-
£1,160 GBP
$1,556 USD
View
Retailer 17
-
£1,369 GBP
SGD 2,483 SGD
View
Price last confirmed 21 days ago
B
Retailer 18
-
£1,386 GBP
$1,860 USD
View
Retailer 19
-
£1,409 GBP
$1,890 USD
View
Price last confirmed 21 days ago
B
Retailer 20
-
£1,412 GBP
$1,895 USD
View
B
Retailer 21
-
£1,584 GBP
View
Most Expensive
Brilliant Earth
21369880A · Oct 14
£1,908 GBP
$2,560 USD
View
Price last confirmed 19 days ago
21 more retailers have this diamond
Prices start from £348 GBPSave up to £1,236 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
1.25ct Round
£348 GBP