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 $249 USD
As of October 30, 2026
Save $1,121 USD (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,370 USD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

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 prices from $249 to $1,370, a $1,121 spread on the same certified stone. Brilliant Earth lists it at $1,370. 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
Color
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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,370 USD|Low: $181 USD|High: $2,430 USD|Avg: $866 USD|-43.6%
Brilliant Earth
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
October 30, 2026
Retailer 12$279 USD
Retailer 5$320 USD
Retailer 11$415 USD
Retailer 8$552 USD
Retailer 2$587 USD
Retailer 4$625 USD
Retailer 13$631 USD
Retailer 10$757 USD
Retailer 6$913 USD
Retailer 14$1,044 USD
Retailer 7$1,238 USD
Retailer 3$1,282 USD
Retailer 9$1,365 USD
Brilliant Earth$1,370 USD

40 data points across 14 retailers

15 retailers$249 USD to $1,370 USD

A
Cheapest Retailer
-
$249 USD
A
Retailer 2
-
$279 USD
View
Final sale: no returns
A
Retailer 3
-
$289 USD
View
A
Retailer 4
-
$309 USD
View
A
Retailer 5
-
$309 USD
View
B+
Retailer 6
-
$415 USD
View
Retailer 7
-
$552 USD
€526 EUR
View
Price last confirmed 7 days ago
B+
Retailer 8
-
$587 USD
£462 GBP
View
B+
Retailer 9
-
$631 USD
View
B+
Retailer 10
-
$757 USD
View
B
Retailer 11
-
$992 USD
View
B
Retailer 12
-
$1,044 USD
View
B
Retailer 13
-
$1,238 USD
£975 GBP
View
Retailer 14
-
$1,365 USD
View
Price last confirmed 12 days ago
Most Expensive
B
Brilliant Earth
21312060A · Oct 30
$1,370 USD
View
14 more retailers have this diamond
Prices start from $249 USDSave up to $1,121 USD

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
$249 USD