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Radiant|Lab Grown|IGI

1.72ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG629439991

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

Certificate IGI LG629439991

Diamond specifications and retailer prices

From £186 GBP
$249 USD
As of October 30, 2026
Save £829 GBP (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,019 GBP at Rare Carat · As of October 18, 2026
View at Rare Carat

About this 1.72ct lab-grown radiant diamond

This 1.72ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG629439991 or 629439991. Listed at 15 retailers as of October 30, 2026, with a 446% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.72
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.3°
Pavilion angle33.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629439991
Dimensions8.76 × 5.89 × 3.93 mm
L/W Ratio1.49
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
8.76 mm5.89 mm1.72 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629439991
Side View
Table 62.0%Crown 45.3°Girdle: MED-STKPavilion 33.8°Culet: NoneDepth 66.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £1,019 GBP|Low: £114 GBP|High: £1,814 GBP|Avg: £538 GBP|-1.8%
Rare Carat
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
Retailer 16
October 31, 2026
Retailer 8£114 GBP
Retailer 14£186 GBP
Retailer 5£208 GBP
Retailer 3£216 GBP
Retailer 4£231 GBP
Retailer 15£231 GBP
Retailer 13£310 GBP
Retailer 9£414 GBP
Retailer 10£434 GBP
Retailer 6£471 GBP
Retailer 12£565 GBP
Retailer 16£740 GBP
Retailer 7£779 GBP
Retailer 11£924 GBP
Retailer 2£1,015 GBP
Rare Carat£1,019 GBP

43 data points across 16 retailers

15 retailers£186 GBP to £1,015 GBP

A
Cheapest Retailer
-
£186 GBP
$249 USD
A
Retailer 2
-
£208 GBP
$279 USD
View
Final sale: no returns
A
Retailer 3
-
£216 GBP
$289 USD
View
A
Retailer 4
-
£231 GBP
$309 USD
View
A
Retailer 5
-
£231 GBP
$309 USD
View
B+
Retailer 6
-
£310 GBP
$415 USD
View
B+
Retailer 7
-
£414 GBP
€528 EUR
View
A
Retailer 8
-
£434 GBP
View
B+
Retailer 9
-
£471 GBP
$631 USD
View
B+
Retailer 10
-
£565 GBP
$757 USD
View
B
Retailer 11
-
£740 GBP
$992 USD
View
B
Retailer 12
-
£779 GBP
$1,044 USD
View
B
Retailer 13
-
£924 GBP
View
B
Retailer 14
-
£1,015 GBP
$1,360 USD
View
Most Expensive
Rare Carat
6R629439991 · Oct 18
£1,019 GBP
$1,365 USD
View
Price last confirmed 13 days ago
14 more retailers have this diamond
Prices start from £186 GBPSave up to £829 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
1.72ct Radiant
£186 GBP