Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2507471981

Certificate GIA 2507471981

Diamond specifications and retailer prices

From $2,854 USD
As of November 6, 2026
Save $4,954 USD (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $7,808 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 2507471981. Listed at 24 retailers as of November 5, 2026, with prices from $2,854 to $7,808, a $4,954 spread on the same certified stone. Diamond Quarter lists it at $7,808. 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
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $3,650 USD|Low: $2,854 USD|High: $6,647 USD|Avg: $4,545 USD|-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$2,854 USD
Retailer 11$3,521 USD
Retailer 4$3,591 USD
Retailer 1$3,650 USD
Retailer 5$3,817 USD
Retailer 2$4,086 USD
Retailer 8$4,387 USD
Retailer 6$4,432 USD
Retailer 7$4,656 USD
Retailer 9$6,380 USD
Retailer 3$6,647 USD

36 data points across 11 retailers

24 retailers$2,854 USD to $7,808 USD

A
Cheapest Retailer
-
$2,854 USD
B+
Retailer 2
-
$3,387 USD
View
B+
Retailer 3
-
$3,442 USD
View
B+
Retailer 4
-
$3,521 USD
View
Final sale: no returns
B+
Retailer 5
-
$3,591 USD
View
B+
Retailer 6
-
$3,612 USD
View
Retailer 7
-
$3,619 USD
View
Price last confirmed 117 days ago
B+
Retailer 8
-
$3,650 USD
View
B+
Retailer 9
-
$3,650 USD
View
Retailer 10
-
$3,815 USD
View
Price last confirmed 39 days ago
B
Retailer 11
-
$3,815 USD
View
Retailer 12
-
$3,815 USD
View
Price last confirmed 12 days ago
B+
Retailer 13
-
$3,817 USD
View
B+
Retailer 14
-
$3,961 USD
View
B+
Retailer 15
-
$3,962 USD
View
Retailer 16
-
$4,086 USD
View
Price last confirmed 29 days ago
B+
Retailer 17
-
$4,387 USD
View
Retailer 18
-
$4,402 USD
View
Price last confirmed 39 days ago
B+
Retailer 19
-
$4,432 USD
View
B
Retailer 20
-
$4,656 USD
View
B
Retailer 21
-
$6,380 USD
View
Retailer 22
-
$6,647 USD
View
Price last confirmed 41 days ago
B
Retailer 23
-
$6,647 USD
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
$7,808 USD
£6,148 GBP
View
23 more retailers have this diamond
Prices start from $2,854 USDSave up to $4,954 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
$2,854 USD