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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 5242066312

Certificate GIA 5242066312

Diamond specifications and retailer prices

From $1,920 USD
As of November 6, 2026
Save $2,634 USD (58%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $4,554 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5242066312. Listed at 7 retailers as of November 1, 2026, with prices from $1,920 to $4,554, a $2,634 spread on the same certified stone. MOH London lists it at $4,554. 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
I
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5242066312
Dimensions6.74 × 6.77 × 4.23 mm
L/W Ratio1.00
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
6.74 mm6.77 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5242066312
Side View
Table 59.0%CrownGirdle: Slightly ThickPavilion 41°Culet: NoneDepth 62.6%

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: Nov 6
Current: $4,554 USD|Low: $1,920 USD|High: $4,907 USD|Avg: $3,083 USD|-7.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6$1,920 USD
Retailer 5$2,348 USD
Retailer 2$2,453 USD
Retailer 3$2,662 USD
Retailer 4$3,157 USD
Retailer 7$4,021 USD
MOH London$4,554 USD

36 data points across 7 retailers

7 retailers$1,920 USD to $4,554 USD

A
Cheapest Retailer
-
$1,920 USD
A
Retailer 2
-
$2,348 USD
View
A
Retailer 3
-
$2,453 USD
View
A
Retailer 4
-
$2,662 USD
View
B+
Retailer 5
-
$3,157 USD
View
B+
Retailer 6
-
$4,021 USD
View
Most Expensive
B
MOH London
8BB82B52B · Nov 1
$4,554 USD
£3,586 GBP
View
6 more retailers have this diamond
Prices start from $1,920 USDSave up to $2,634 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 Round
$1,920 USD