Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6455803337

Certificate GIA 6455803337

Diamond specifications and retailer prices

From €3,439 EUR
As of November 6, 2026
Save €4,076 EUR (54%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: €10,359 EUR 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
Colour
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: €4,220 EUR|Low: €3,439 EUR|High: €6,953 EUR|Avg: €4,544 EUR|+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€3,439 EUR
Retailer 5€3,466 EUR
Retailer 7€3,708 EUR
Retailer 9€3,908 EUR
Retailer 1€4,220 EUR
Retailer 6€4,348 EUR
Retailer 3€4,849 EUR
Retailer 2€5,263 EUR
Retailer 4€6,852 EUR

45 data points across 9 retailers

15 retailers€3,439 EUR to €7,515 EUR

B+
Cheapest Retailer
-
€3,439 EUR
B+
Retailer 2
-
€3,466 EUR
View
B+
Retailer 3
-
€3,708 EUR
View
B+
Retailer 4
-
€3,908 EUR
View
Retailer 5
-
€3,908 EUR
View
Price last confirmed 8 days ago
B+
Retailer 6
-
€3,908 EUR
View
B+
Retailer 7
-
€4,220 EUR
View
Retailer 8
-
€4,348 EUR
View
Price last confirmed 28 days ago
B
Retailer 9
-
€4,510 EUR
View
Retailer 10
-
€4,763 EUR
View
Price last confirmed 14 days ago
B
Retailer 11
-
€4,849 EUR
View
B
Retailer 12
-
€5,263 EUR
View
B
Retailer 13
-
€6,852 EUR
View
B
Retailer 14
-
€7,515 EUR
View
Most Expensive
Diamond Quarter
1.21SI1H64372F45N · Nov 5
€10,359 EUR
£9,107 GBP
View
Price under review
14 more retailers have this diamond
Prices start from €3,439 EURSave up to €4,076 EUR

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
€3,439 EUR