Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6455803337

Certificate GIA 6455803337

Diamond specifications and retailer prices

From $3,840 USD
As of November 6, 2026
Save $4,551 USD (54%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $11,566 USD at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6455803337. Listed at 15 retailers as of November 5, 2026, with a 119% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
H
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6455803337
Dimensions6.85 × 6.80 × 4.21 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.85 mm6.80 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6455803337
Side View
Table 57.0%Crown 34°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.7%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $4,712 USD|Low: $3,840 USD|High: $7,763 USD|Avg: $5,073 USD|+1.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 8$3,840 USD
Retailer 5$3,870 USD
Retailer 7$4,140 USD
Retailer 9$4,363 USD
Retailer 1$4,712 USD
Retailer 6$4,855 USD
Retailer 3$5,414 USD
Retailer 2$5,876 USD
Retailer 4$7,650 USD

45 data points across 9 retailers

15 retailers$3,840 USD to $8,391 USD

B+
Cheapest Retailer
-
$3,840 USD
B+
Retailer 2
-
$3,870 USD
View
B+
Retailer 3
-
$4,140 USD
View
B+
Retailer 4
-
$4,363 USD
View
Retailer 5
-
$4,363 USD
View
Price last confirmed 8 days ago
B+
Retailer 6
-
$4,363 USD
View
B+
Retailer 7
-
$4,712 USD
View
Retailer 8
-
$4,855 USD
View
Price last confirmed 28 days ago
B
Retailer 9
-
$5,035 USD
View
Retailer 10
-
$5,318 USD
View
Price last confirmed 14 days ago
B
Retailer 11
-
$5,414 USD
View
B
Retailer 12
-
$5,876 USD
View
B
Retailer 13
-
$7,650 USD
View
B
Retailer 14
-
$8,391 USD
View
Most Expensive
Diamond Quarter
1.21SI1H64372F45N · Nov 5
$11,566 USD
£9,107 GBP
View
Price under review
14 more retailers have this diamond
Prices start from $3,840 USDSave up to $4,551 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.

B+
1.21ct Round
$3,840 USD