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Radiant|Lab Grown|IGI

1.71ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG818654290

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

Certificate IGI LG818654290

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)
22 retailers carry this diamond
Most expensive: £3,045 GBP at Rare Carat · As of October 28, 2026
View at Rare Carat

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 LG818654290 or 818654290. Listed at 22 retailers as of October 28, 2026, with prices from £445 to £3,045, a £2,600 spread on the same certified stone. Rare Carat lists it at £3,045. 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 angle42.2°
Pavilion angle35.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818654290
Dimensions8.08 × 5.93 × 4.08 mm
L/W Ratio1.36
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
8.08 mm5.93 mm1.71 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818654290
Side View
Table 63.0%Crown 42.2°Girdle: MED-STKPavilion 35.7°Culet: NoneDepth 68.8%

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: Oct 30
Current: £3,045 GBP|Low: £445 GBP|High: £4,090 GBP|Avg: £1,420 GBP|-1.1%
Rare Carat
Retailer 2
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Retailer 21
October 30, 2026
Retailer 12£445 GBP
Retailer 19£498 GBP
Retailer 8£516 GBP
Retailer 11£552 GBP
Retailer 18£649 GBP
Retailer 21£714 GBP
Retailer 4£847 GBP
Retailer 15£862 GBP
Retailer 3£900 GBP
Retailer 17£948 GBP
Retailer 6£1,017 GBP
Retailer 5£1,195 GBP
Retailer 9£1,450 GBP
Retailer 7£1,604 GBP
Retailer 14£1,784 GBP
Retailer 2£1,809 GBP
Retailer 10£1,875 GBP
Retailer 20£1,973 GBP
Retailer 16£2,407 GBP
Retailer 13£2,978 GBP
Rare Carat£3,045 GBP

31 data points across 21 retailers

22 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
-
£714 GBP
$957 USD
View
A
Retailer 8
-
£847 GBP
$1,135 USD
View
A
Retailer 9
-
£862 GBP
View
Retailer 10
-
£900 GBP
€1,148 EUR
View
Price last confirmed 7 days ago
B+
Retailer 11
-
£948 GBP
ZAR 20,514 ZAR
View
B+
Retailer 12
-
£1,017 GBP
$1,363 USD
View
B+
Retailer 13
-
£1,195 GBP
$1,601 USD
View
B+
Retailer 14
-
£1,450 GBP
$1,943 USD
View
B+
Retailer 15
-
£1,604 GBP
View
B+
Retailer 16
-
£1,784 GBP
$2,390 USD
View
B+
Retailer 17
-
£1,809 GBP
$2,424 USD
View
B+
Retailer 18
-
£1,875 GBP
SGD 3,395 SGD
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
Most Expensive
B
Rare Carat
PD-237885 · Oct 28
£3,045 GBP
$4,080 USD
View
21 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