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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 $354 AUD
$249 USD
As of October 30, 2026
Save $1,582 AUD (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,943 AUD 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: $1,943 AUD|Low: $340 AUD|High: $3,459 AUD|Avg: $1,085 AUD|-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
November 1, 2026
Retailer 13$354 AUD
Retailer 5$397 AUD
Retailer 3$411 AUD
Retailer 4$440 AUD
Retailer 14$440 AUD
Retailer 12$591 AUD
Retailer 9$789 AUD
Retailer 2$829 AUD
Retailer 6$898 AUD
Retailer 11$1,078 AUD
Retailer 15$1,412 AUD
Retailer 7$1,486 AUD
Retailer 10$1,763 AUD
Retailer 8$1,936 AUD
Rare Carat$1,943 AUD

44 data points across 15 retailers

15 retailers$354 AUD to $1,936 AUD

A
Cheapest Retailer
-
$354 AUD
$249 USD
A
Retailer 2
-
$397 AUD
$279 USD
View
Final sale: no returns
A
Retailer 3
-
$411 AUD
$289 USD
View
A
Retailer 4
-
$440 AUD
$309 USD
View
A
Retailer 5
-
$440 AUD
$309 USD
View
B+
Retailer 6
-
$591 AUD
$415 USD
View
B+
Retailer 7
-
$789 AUD
€528 EUR
View
A
Retailer 8
-
$829 AUD
£458 GBP
View
B+
Retailer 9
-
$898 AUD
$631 USD
View
B+
Retailer 10
-
$1,078 AUD
$757 USD
View
B
Retailer 11
-
$1,412 AUD
$992 USD
View
B
Retailer 12
-
$1,486 AUD
$1,044 USD
View
B
Retailer 13
-
$1,763 AUD
£975 GBP
View
B
Retailer 14
-
$1,936 AUD
$1,360 USD
View
Most Expensive
Rare Carat
6R629439991 · Oct 18
$1,943 AUD
$1,365 USD
View
Price last confirmed 13 days ago
14 more retailers have this diamond
Prices start from $354 AUDSave up to $1,582 AUD

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
$354 AUD