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Radiant|Lab Grown|IGI

1.70ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG818659742

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

Certificate IGI LG818659742

Diamond specifications and retailer prices

From £445 GBP
$593 USD
As of October 30, 2026
Save £3,640 GBP (89%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,085 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.7ct lab-grown radiant diamond

This 1.7ct 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 LG818659742 or 818659742. Listed at 22 retailers as of October 29, 2026, with prices from £445 to £4,085, a £3,640 spread on the same certified stone. Brilliant Earth lists it at £4,085. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.70
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.8°
Pavilion angle36.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818659742
Dimensions8.20 × 6.12 × 3.97 mm
L/W Ratio1.34
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
8.20 mm6.12 mm1.70 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818659742
Side View
Table 66.0%Crown 42.8°Girdle: MED-STKPavilion 36.3°Culet: NoneDepth 64.9%

Caratlytics Score

How it works →
A+
Exceptional
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: £4,085 GBP|Low: £445 GBP|High: £4,085 GBP|Avg: £1,522 GBP
Brilliant Earth
Retailer 2
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Retailer 21
October 30, 2026
Retailer 12£445 GBP
Retailer 20£499 GBP
Retailer 16£517 GBP
Retailer 11£552 GBP
Retailer 18£585 GBP
Retailer 17£650 GBP
Retailer 4£847 GBP
Retailer 2£863 GBP
Retailer 3£900 GBP
Retailer 15£948 GBP
Retailer 6£1,012 GBP
Retailer 5£1,245 GBP
Retailer 9£1,451 GBP
Retailer 7£1,602 GBP
Retailer 19£1,761 GBP
Retailer 8£1,785 GBP
Retailer 10£1,878 GBP
Retailer 13£2,408 GBP
Retailer 21£2,632 GBP
Retailer 14£3,045 GBP
Brilliant Earth£4,085 GBP

27 data points across 21 retailers

22 retailers£445 GBP to £4,085 GBP

A+
Cheapest Retailer
-
£445 GBP
$593 USD
A
Retailer 2
-
£499 GBP
$664 USD
View
A
Retailer 3
-
£517 GBP
$688 USD
View
Final sale: no returns
Retailer 4
-
£550 GBP
$733 USD
View
Price last confirmed 13 days ago
A
Retailer 5
-
£552 GBP
$735 USD
View
A
Retailer 6
-
£585 GBP
View
A
Retailer 7
-
£650 GBP
$865 USD
View
A
Retailer 8
-
£847 GBP
$1,128 USD
View
A
Retailer 9
-
£863 GBP
View
A
Retailer 10
-
£900 GBP
€1,142 EUR
View
B+
Retailer 11
-
£948 GBP
ZAR 20,400 ZAR
View
B+
Retailer 12
-
£1,012 GBP
$1,348 USD
View
B+
Retailer 13
-
£1,245 GBP
$1,658 USD
View
B+
Retailer 14
-
£1,451 GBP
$1,932 USD
View
B+
Retailer 15
-
£1,602 GBP
View
B+
Retailer 16
-
£1,761 GBP
$2,345 USD
View
B+
Retailer 17
-
£1,785 GBP
$2,377 USD
View
B+
Retailer 18
-
£1,878 GBP
SGD 3,379 SGD
View
B
Retailer 19
-
£2,408 GBP
View
B
Retailer 20
-
£2,632 GBP
$3,505 USD
View
B
Retailer 21
-
£3,045 GBP
$4,055 USD
View
Most Expensive
B
Brilliant Earth
21421666A · Oct 29
£4,085 GBP
$5,440 USD
View
21 more retailers have this diamond
Prices start from £445 GBPSave up to £3,640 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+
1.70ct Radiant
£445 GBP