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Radiant|Natural|IGI

1.51ct I SI2 Radiant Natural Diamond

VG • I/SI2 • IGI 821635041

Certificate IGI 821635041

Diamond specifications and retailer prices

From $2,156 USD
Save $3,320 USD (61%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,476 USD at NZ Jewellers
View at NZ Jewellers

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI 821635041. Listed at 12 retailers, with prices from $2,156 to $5,476 at NZ Jewellers, a $3,320 spread on the same certified stone. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
I
Color
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.8°
Pavilion angle34.9°
OriginNatural
Grading LabIGI
CertificateIGI 821635041
Dimensions7.07 × 5.60 × 4.40 mm
L/W Ratio1.26
Top View
7.07 mm5.60 mm1.51 ctI / SI2
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 821635041
Side View
Table 75.0%Crown 41.8°Girdle: Slightly ThickPavilion 34.9°CuletDepth 78.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0-100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 1
Current: $2,548 USD|Low: $2,147 USD|High: $4,665 USD|Avg: $2,935 USD|-3.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 1, 2026
Retailer 2$2,156 USD
Retailer 4$2,303 USD
Retailer 5$2,509 USD
Retailer 1$2,548 USD
Retailer 3$2,548 USD
Retailer 7$2,760 USD
Retailer 8$3,217 USD
Retailer 9$3,293 USD
Retailer 6$4,519 USD

20 data points across 9 retailers

12 retailers$2,156 USD to $5,476 USD

B+
Cheapest Retailer
-
$2,156 USD
B+
Retailer 2
-
$2,303 USD
View
B+
Retailer 3
-
$2,509 USD
£1,976 GBP
View
B+
Retailer 4
-
$2,548 USD
View
B+
Retailer 5
-
$2,548 USD
View
B+
Retailer 6
-
$2,666 USD
View
B+
Retailer 7
-
$2,760 USD
View
B+
Retailer 8
-
$3,022 USD
View
B+
Retailer 9
-
$3,217 USD
€3,064 EUR
View
B+
Retailer 10
-
$3,293 USD
ZAR 53,201 ZAR
View
Price last confirmed 43 days ago
B+
Retailer 11
-
$4,519 USD
£3,558 GBP
View
Most Expensive
B
NZ Jewellers
fa673a22-8651-49a4-9fc7-ee2e16c34f0f · Sep 29
$5,476 USD
View
11 more retailers have this diamond
Prices start from $2,156 USDSave up to $3,320 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.

B+
1.51ct Radiant
$2,156 USD