CaratHunter
Plans
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 $442 NZD
$249 USD
As of October 30, 2026
Save $1,971 NZD (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $2,422 NZD 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

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: $2,422 NZD|Low: $424 NZD|High: $4,312 NZD|Avg: $1,349 NZD|-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$442 NZD
Retailer 5$495 NZD
Retailer 3$513 NZD
Retailer 4$548 NZD
Retailer 14$548 NZD
Retailer 12$736 NZD
Retailer 9$984 NZD
Retailer 2$1,033 NZD
Retailer 6$1,120 NZD
Retailer 11$1,343 NZD
Retailer 15$1,760 NZD
Retailer 7$1,852 NZD
Retailer 10$2,197 NZD
Retailer 8$2,413 NZD
Rare Carat$2,422 NZD

43 data points across 15 retailers

15 retailers$442 NZD to $2,413 NZD

A
Cheapest Retailer
-
$442 NZD
$249 USD
A
Retailer 2
-
$495 NZD
$279 USD
View
Final sale: no returns
A
Retailer 3
-
$513 NZD
$289 USD
View
Retailer 4
-
$548 NZD
$309 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$548 NZD
$309 USD
View
B+
Retailer 6
-
$736 NZD
$415 USD
View
B+
Retailer 7
-
$984 NZD
€528 EUR
View
A
Retailer 8
-
$1,033 NZD
£458 GBP
View
B+
Retailer 9
-
$1,120 NZD
$631 USD
View
B+
Retailer 10
-
$1,343 NZD
$757 USD
View
B
Retailer 11
-
$1,760 NZD
$992 USD
View
B
Retailer 12
-
$1,852 NZD
$1,044 USD
View
B
Retailer 13
-
$2,197 NZD
£975 GBP
View
B
Retailer 14
-
$2,413 NZD
$1,360 USD
View
Most Expensive
Rare Carat
6R629439991 · Oct 18
$2,422 NZD
$1,365 USD
View
Price last confirmed 14 days ago
14 more retailers have this diamond
Prices start from $442 NZDSave up to $1,971 NZD

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
$442 NZD