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Radiant|Lab Grown|IGI

1.71ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG811638560

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

Certificate IGI LG811638560

Diamond specifications and retailer prices

From £445 GBP
$596 USD
As of October 30, 2026
Save £2,600 GBP (85%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £4,217 GBP at Brilliant Earth · As of September 28, 2026
View at Brilliant Earth

About this 1.71ct lab-grown radiant diamond

This 1.71ct lab-grown radiant 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 LG811638560 or 811638560. Listed at 23 retailers as of October 28, 2026, with a 585% 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

1.71
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.4°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811638560
Dimensions8.23 × 6.01 × 4.02 mm
L/W Ratio1.37
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
8.23 mm6.01 mm1.71 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811638560
Side View
Table 67.0%Crown 45.4°Girdle: MED-STKPavilion 36°Culet: NoneDepth 66.9%

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 30
Current: £2,978 GBP|Low: £445 GBP|High: £4,090 GBP|Avg: £1,539 GBP|-27.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
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Retailer 10
Retailer 11
Retailer 12
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Retailer 20
October 30, 2026
Retailer 12£445 GBP
Retailer 19£498 GBP
Retailer 17£516 GBP
Retailer 11£552 GBP
Retailer 18£649 GBP
Retailer 4£847 GBP
Retailer 13£862 GBP
Retailer 3£900 GBP
Retailer 15£948 GBP
Retailer 6£1,017 GBP
Retailer 5£1,195 GBP
Retailer 9£1,450 GBP
Retailer 7£1,604 GBP
Retailer 8£1,784 GBP
Retailer 2£1,809 GBP
Retailer 10£1,875 GBP
Retailer 20£1,973 GBP
Retailer 14£2,407 GBP
Brilliant Earth£2,978 GBP
Retailer 16£3,045 GBP

28 data points across 20 retailers

23 retailers£445 GBP to £3,045 GBP

A
Cheapest Retailer
-
£445 GBP
$596 USD
A
Retailer 2
-
£498 GBP
$667 USD
View
A
Retailer 3
-
£516 GBP
$692 USD
View
Final sale: no returns
Retailer 4
-
£551 GBP
$738 USD
View
Price last confirmed 14 days ago
A
Retailer 5
-
£552 GBP
$739 USD
View
A
Retailer 6
-
£649 GBP
$870 USD
View
A
Retailer 7
-
£847 GBP
$1,135 USD
View
A
Retailer 8
-
£862 GBP
View
Retailer 9
-
£900 GBP
€1,148 EUR
View
Price last confirmed 7 days ago
B+
Retailer 10
-
£948 GBP
ZAR 20,514 ZAR
View
B+
Retailer 11
-
£1,017 GBP
$1,363 USD
View
B+
Retailer 12
-
£1,195 GBP
$1,601 USD
View
B+
Retailer 13
-
£1,450 GBP
$1,943 USD
View
B+
Retailer 14
-
£1,604 GBP
View
B+
Retailer 15
-
£1,784 GBP
$2,390 USD
View
B+
Retailer 16
-
£1,809 GBP
$2,424 USD
View
B+
Retailer 17
-
£1,875 GBP
SGD 3,395 SGD
View
B+
Retailer 18
-
£1,935 GBP
$2,593 USD
View
B
Retailer 19
-
£1,973 GBP
$2,644 USD
View
B
Retailer 20
-
£2,407 GBP
View
B
Retailer 21
-
£2,978 GBP
$3,990 USD
View
B
Retailer 22
-
£3,045 GBP
$4,080 USD
View
Most Expensive
Brilliant Earth
20987967A · Sep 28
£4,217 GBP
$5,650 USD
View
Price last confirmed 32 days ago
22 more retailers have this diamond
Prices start from £445 GBPSave up to £2,600 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
1.71ct Radiant
£445 GBP