Radiant|Natural|GIA

1.21ct E SI1 Radiant Natural Diamond

EX • E/SI1 • GIA 2518450103

Certificate GIA 2518450103

Diamond specifications and retailer prices

From $3,973 USD
Save $3,605 USD (48%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $7,578 USD at MOH London
View at MOH London

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2518450103. Listed at 12 retailers, with prices from $3,973 to $7,578 at MOH London, a $3,605 spread on the same certified stone. 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
E
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.29°
Pavilion angle30.5°
OriginNatural
Grading LabGIA
CertificateGIA 2518450103
Dimensions6.67 × 5.23 × 3.64 mm
L/W Ratio1.28
Top View
6.67 mm5.23 mm1.21 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2518450103
Side View
Table 65.0%Crown 44.29°Girdle: THK-VTKPavilion 30.5°Culet: NoneDepth 69.7%

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: Sep 30
Current: $7,578 USD|Low: $3,973 USD|High: $7,578 USD|Avg: $5,027 USD|+1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 1, 2026
Retailer 5$3,973 USD
Retailer 10$4,059 USD
Retailer 9$4,214 USD
Retailer 7$4,371 USD
Retailer 8$4,683 USD
Retailer 4$4,694 USD
Retailer 11$4,937 USD
Retailer 2$4,992 USD
Retailer 3$6,034 USD
Retailer 6$6,868 USD
MOH London$7,578 USD

32 data points across 11 retailers

12 retailers$3,973 USD to $7,578 USD

B+
Cheapest Retailer
-
$3,973 USD
B+
Retailer 2
-
$4,059 USD
CA$5,638 CAD
View
B+
Retailer 3
-
$4,214 USD
View
B+
Retailer 4
-
$4,371 USD
View
B+
Retailer 5
-
$4,683 USD
View
B+
Retailer 6
-
$4,704 USD
£3,704 GBP
View
B
Retailer 7
-
$4,840 USD
View
B
Retailer 8
-
$4,840 USD
View
B+
Retailer 9
-
$4,992 USD
€4,754 EUR
View
B
Retailer 10
-
$5,000 USD
View
Price last confirmed 12 days ago
B
Retailer 11
-
$6,868 USD
View
Most Expensive
B
MOH London
066A34DF0 · Sep 28
$7,578 USD
£5,967 GBP
View
11 more retailers have this diamond
Prices start from $3,973 USDSave up to $3,605 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+
1.21ct Radiant
$3,973 USD