Radiant|Natural|GIA

1.51ct I SI2 Radiant Natural Diamond

ID • I/SI2 • GIA 1518170862

Certificate GIA 1518170862

Diamond specifications and retailer prices

From $3,989 USD
£3,141 GBP
As of November 1, 2026
Save $3,136 USD (44%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $7,125 USD at NZ Jewellers · As of October 30, 2026
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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1518170862. Listed at 6 retailers as of October 30, 2026, with prices from $3,989 to $7,125, a $3,136 spread on the same certified stone. NZ Jewellers lists it at $7,125. 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

1.51
Carat
I
Color
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.77°
Pavilion angle31.26°
OriginNatural
Grading LabGIA
CertificateGIA 1518170862
Dimensions7.73 × 5.92 × 3.71 mm
L/W Ratio1.31
Girdle conditionSlightly Thick
Key to symbols
Crystal, Twinning Wisp, Feather, Needle
Top View
7.73 mm5.92 mm1.51 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1518170862
Side View
Table 70.0%Crown 44.77°Girdle: MediumPavilion 31.26°Culet: NoneDepth 62.7%

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: Nov 1
Current: $7,125 USD|Low: $3,988 USD|High: $7,219 USD|Avg: $4,951 USD|-1.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2$3,989 USD
Retailer 4$4,089 USD
Retailer 5$4,089 USD
Retailer 6$4,232 USD
Retailer 9$4,302 USD
Retailer 7$4,637 USD
Retailer 8$4,665 USD
Retailer 10$4,810 USD
Retailer 3$6,839 USD
NZ Jewellers$7,125 USD

34 data points across 10 retailers

6 retailers$3,989 USD to $7,125 USD

A
Cheapest Retailer
-
$3,989 USD
£3,141 GBP
A
Retailer 2
-
$4,089 USD
View
A
Retailer 3
-
$4,089 USD
View
A
Retailer 4
-
$4,232 USD
View
B+
Retailer 5
-
$6,839 USD
£5,385 GBP
View
Most Expensive
B
NZ Jewellers
84c6226e-ee67-4228-a4df-b55c55477ffb · Oct 30
$7,125 USD
View
5 more retailers have this diamond
Prices start from $3,989 USDSave up to $3,136 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
1.51ct Radiant
$3,989 USD