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Radiant|Lab Grown|IGI

1.71ct H SI1 Radiant Lab Grown Diamond

ID • H/SI1 • IGI LG512231580

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

Certificate IGI LG512231580

Diamond specifications and retailer prices

From $1,552 AUD
$1,090 USD
As of October 31, 2026
Save $6,127 AUD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $7,678 AUD at MOH London · As of November 1, 2026
View at MOH London

About this 1.71ct lab-grown radiant diamond

This 1.71ct lab-grown radiant sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG512231580 or 512231580. Listed at 11 retailers as of October 31, 2026, with prices from $1,552 to $7,678, a $6,127 spread on the same certified stone. MOH London lists it at $7,678. 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

1.71
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.1°
Pavilion angle30.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512231580
Dimensions7.68 × 5.82 × 4.03 mm
L/W Ratio1.32
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.68 mm5.82 mm1.71 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512231580
Side View
Table 68.0%Crown 47.1°Girdle: ThickPavilion 30.1°Culet: NoneDepth 69.2%

Caratlytics Score

How it works →
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 31
Current: $7,678 AUD|Low: $1,552 AUD|High: $7,771 AUD|Avg: $3,991 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 1, 2026
Retailer 2$1,552 AUD
Retailer 7$2,318 AUD
Retailer 11$2,521 AUD
Retailer 12$2,595 AUD
Retailer 8$2,689 AUD
Retailer 13$2,933 AUD
Retailer 5$2,957 AUD
Retailer 3$3,615 AUD
Retailer 9$4,225 AUD
Retailer 6$4,635 AUD
Retailer 10$5,040 AUD
MOH London$7,678 AUD
Retailer 4$7,698 AUD

18 data points across 13 retailers

11 retailers$1,552 AUD to $7,678 AUD

A
Cheapest Retailer
-
$1,552 AUD
$1,090 USD
B+
Retailer 2
-
$2,318 AUD
$1,628 USD
View
B+
Retailer 3
-
$2,521 AUD
$1,771 USD
View
B+
Retailer 4
-
$2,595 AUD
$1,823 USD
View
Final sale: no returns
Retailer 5
-
$2,689 AUD
$1,889 USD
View
Price last confirmed 19 days ago
B+
Retailer 6
-
$2,689 AUD
$1,889 USD
View
B+
Retailer 7
-
$2,933 AUD
$2,060 USD
View
B
Retailer 8
-
$4,225 AUD
$2,968 USD
View
B
Retailer 9
-
$4,635 AUD
$3,256 USD
View
B
Retailer 10
-
$5,040 AUD
$3,540 USD
View
Most Expensive
B
MOH London
LG512231580 · Nov 1
$7,678 AUD
£4,247 GBP
View
10 more retailers have this diamond
Prices start from $1,552 AUDSave up to $6,127 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
1.71ct Radiant
$1,552 AUD