Radiant|Natural|GIA

1.21ct J SI1 Radiant Natural Diamond

EX • J/SI1 • GIA 2558197624

Certificate GIA 2558197624

Diamond specifications and retailer prices

From $1,600 USD
As of November 6, 2026
Save $2,147 USD (57%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $3,747 USD at MOH London · As of November 2, 2026
View at MOH London

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2558197624. Listed at 14 retailers as of November 2, 2026, with prices from $1,600 to $3,747, a $2,147 spread on the same certified stone. MOH London lists it at $3,747. 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

1.21
Carat
J
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2558197624
Dimensions7.23 × 5.56 × 3.78 mm
L/W Ratio1.30
Top View
7.23 mm5.56 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2558197624
Side View
Table 68.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 68.0%

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 6
Current: $3,747 USD|Low: $1,600 USD|High: $3,814 USD|Avg: $2,356 USD|-1.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 11$1,600 USD
Retailer 5$1,681 USD
Retailer 8$1,990 USD
Retailer 3$2,151 USD
Retailer 6$2,230 USD
Retailer 10$2,240 USD
Retailer 12$2,276 USD
Retailer 2$2,322 USD
Retailer 4$2,466 USD
Retailer 9$2,609 USD
Retailer 7$2,905 USD
MOH London$3,747 USD

30 data points across 12 retailers

14 retailers$1,600 USD to $3,747 USD

A
Cheapest Retailer
-
$1,600 USD
A
Retailer 2
-
$1,681 USD
View
B+
Retailer 3
-
$1,990 USD
View
B+
Retailer 4
-
$2,027 USD
View
Retailer 5
-
$2,151 USD
View
Price last confirmed 9 days ago
B+
Retailer 6
-
$2,230 USD
View
B+
Retailer 7
-
$2,240 USD
View
B+
Retailer 8
-
$2,247 USD
View
B+
Retailer 9
-
$2,276 USD
View
B+
Retailer 10
-
$2,322 USD
View
B
Retailer 11
-
$2,609 USD
View
Retailer 12
-
$2,660 USD
View
Price last confirmed 32 days ago
B
Retailer 13
-
$2,905 USD
View
Most Expensive
B
MOH London
599C3FF43 · Nov 2
$3,747 USD
£2,950 GBP
View
13 more retailers have this diamond
Prices start from $1,600 USDSave up to $2,147 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
1.21ct Radiant
$1,600 USD