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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 $1,090 USD
As of October 31, 2026
Save $4,304 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $5,394 USD 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 $1,090 to $5,394, a $4,304 spread on the same certified stone. MOH London lists it at $5,394. 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
Color
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $5,394 USD|Low: $1,090 USD|High: $5,458 USD|Avg: $2,803 USD
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$1,090 USD
Retailer 7$1,628 USD
Retailer 11$1,771 USD
Retailer 12$1,823 USD
Retailer 8$1,889 USD
Retailer 13$2,060 USD
Retailer 5$2,077 USD
Retailer 3$2,539 USD
Retailer 9$2,968 USD
Retailer 6$3,256 USD
Retailer 10$3,540 USD
MOH London$5,394 USD
Retailer 4$5,408 USD

18 data points across 13 retailers

11 retailers$1,090 USD to $5,394 USD

A
Cheapest Retailer
-
$1,090 USD
B+
Retailer 2
-
$1,628 USD
View
B+
Retailer 3
-
$1,771 USD
View
B+
Retailer 4
-
$1,823 USD
View
Final sale: no returns
Retailer 5
-
$1,889 USD
View
Price last confirmed 19 days ago
B+
Retailer 6
-
$1,889 USD
View
B+
Retailer 7
-
$2,060 USD
View
B
Retailer 8
-
$2,968 USD
View
B
Retailer 9
-
$3,256 USD
View
B
Retailer 10
-
$3,540 USD
View
Most Expensive
B
MOH London
LG512231580 · Nov 1
$5,394 USD
£4,247 GBP
View
10 more retailers have this diamond
Prices start from $1,090 USDSave up to $4,304 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
1.71ct Radiant
$1,090 USD