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Round|Lab Grown|IGI

1.51ct D FL Round Lab Grown Diamond

ID • D/FL • IGI LG780685531

Shape and cutting style on the report: Round brilliant

Certificate IGI LG780685531

Diamond specifications and retailer prices

From £549 GBP
$735 USD
As of October 31, 2026
Save £2,235 GBP (80%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £2,784 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780685531 or 780685531. Listed at 22 retailers as of October 31, 2026, with prices from £549 to £2,784, a £2,235 spread on the same certified stone. Brilliant Earth lists it at £2,784. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.9°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780685531
Dimensions7.40 × 7.46 × 4.52 mm
L/W Ratio1.01
Girdle conditionFaceted
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
7.40 mm7.46 mm1.51 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780685531
Side View
Table 55.0%Crown 32.9°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.9%

Caratlytics Score

How it works →
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 31
Current: £2,784 GBP|Low: £471 GBP|High: £3,627 GBP|Avg: £1,404 GBP|-23.3%
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
November 1, 2026
Retailer 3£490 GBP
Retailer 4£549 GBP
Retailer 7£569 GBP
Retailer 2£778 GBP
Retailer 10£806 GBP
Retailer 6£813 GBP
Retailer 13£877 GBP
Retailer 8£906 GBP
Retailer 12£1,036 GBP
Retailer 14£1,321 GBP
Retailer 15£1,832 GBP
Retailer 5£1,979 GBP
Retailer 11£2,400 GBP
Retailer 9£2,679 GBP
Brilliant Earth£2,784 GBP

37 data points across 15 retailers

22 retailers£549 GBP to £2,784 GBP

Retailer 1
-
£490 GBP
$657 USD
Price last confirmed 21 days ago
Retailer 2
-
£534 GBP
$715 USD
View
Price last confirmed 19 days ago
A
Retailer 3
-
£549 GBP
$735 USD
View
Final sale: no returns
Retailer 4
-
£569 GBP
$762 USD
View
Price last confirmed 19 days ago
Retailer 5
-
£569 GBP
$762 USD
View
Price last confirmed 29 days ago
B+
Retailer 6
-
£750 GBP
$1,005 USD
View
A
Retailer 7
-
£778 GBP
View
B+
Retailer 8
-
£803 GBP
$1,076 USD
View
B+
Retailer 9
-
£806 GBP
$1,080 USD
View
B+
Retailer 10
-
£813 GBP
$1,090 USD
View
B+
Retailer 11
-
£877 GBP
A$1,808 AUD
View
B+
Retailer 12
-
£906 GBP
View
Retailer 13
-
£1,036 GBP
ZAR 22,422 ZAR
View
Price last confirmed 8 days ago
B
Retailer 14
-
£1,321 GBP
$1,770 USD
View
Retailer 15
-
£1,599 GBP
$2,143 USD
View
Price last confirmed 24 days ago
B
Retailer 16
-
£1,832 GBP
$2,455 USD
View
B
Retailer 17
-
£1,914 GBP
SGD 3,466 SGD
View
B
Retailer 18
-
£1,962 GBP
$2,630 USD
View
B
Retailer 19
-
£1,979 GBP
$2,652 USD
View
B
Retailer 20
-
£2,400 GBP
View
B
Retailer 21
-
£2,679 GBP
€3,418 EUR
View
Most Expensive
B
Brilliant Earth
18647900A · Oct 31
£2,784 GBP
$3,730 USD
View
21 more retailers have this diamond
Prices start from £549 GBPSave up to £2,235 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
1.51ct Round
£549 GBP