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1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2507471981

Certificate GIA 2507471981

Diamond specifications and retailer prices

From €2,556 EUR
As of November 6, 2026
Save €4,437 EUR (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: €6,993 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 2507471981. Listed at 24 retailers as of November 5, 2026, with prices from €2,556 to €6,993, a €4,437 spread on the same certified stone. Diamond Quarter lists it at €6,993. 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
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2507471981
Dimensions6.77 × 6.74 × 4.23 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.77 mm6.74 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2507471981
Side View
Table 59.0%Crown 36°Girdle: THN-STKPavilion 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: €3,269 EUR|Low: €2,556 EUR|High: €5,953 EUR|Avg: €4,071 EUR|-1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10€2,556 EUR
Retailer 11€3,154 EUR
Retailer 4€3,216 EUR
Retailer 1€3,269 EUR
Retailer 5€3,419 EUR
Retailer 2€3,660 EUR
Retailer 8€3,929 EUR
Retailer 6€3,970 EUR
Retailer 7€4,170 EUR
Retailer 9€5,714 EUR
Retailer 3€5,953 EUR

36 data points across 11 retailers

24 retailers€2,556 EUR to €6,993 EUR

A
Cheapest Retailer
-
€2,556 EUR
B+
Retailer 2
-
€3,034 EUR
View
B+
Retailer 3
-
€3,083 EUR
View
B+
Retailer 4
-
€3,154 EUR
View
Final sale: no returns
B+
Retailer 5
-
€3,216 EUR
View
B+
Retailer 6
-
€3,235 EUR
View
Retailer 7
-
€3,241 EUR
View
Price last confirmed 117 days ago
B+
Retailer 8
-
€3,269 EUR
View
B+
Retailer 9
-
€3,269 EUR
View
Retailer 10
-
€3,417 EUR
View
Price last confirmed 39 days ago
B
Retailer 11
-
€3,417 EUR
View
Retailer 12
-
€3,417 EUR
View
Price last confirmed 12 days ago
B+
Retailer 13
-
€3,419 EUR
View
B+
Retailer 14
-
€3,548 EUR
View
B+
Retailer 15
-
€3,549 EUR
View
Retailer 16
-
€3,660 EUR
View
Price last confirmed 29 days ago
B+
Retailer 17
-
€3,929 EUR
View
Retailer 18
-
€3,943 EUR
View
Price last confirmed 39 days ago
B+
Retailer 19
-
€3,970 EUR
View
B
Retailer 20
-
€4,170 EUR
View
B
Retailer 21
-
€5,714 EUR
View
Retailer 22
-
€5,953 EUR
View
Price last confirmed 41 days ago
B
Retailer 23
-
€5,953 EUR
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
€6,993 EUR
£6,148 GBP
View
23 more retailers have this diamond
Prices start from €2,556 EURSave up to €4,437 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.

A
1.21ct Round
€2,556 EUR