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Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6512424390

Certificate GIA 6512424390

Diamond specifications and retailer prices

From $3,856 USD
As of November 5, 2026
Save $3,777 USD (49%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $7,633 USD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

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 6512424390. Listed at 17 retailers as of November 5, 2026, with prices from $3,856 to $7,633, a $3,777 spread on the same certified stone. NZ Jewellers lists it at $7,633. 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 angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6512424390
Dimensions6.86 × 6.81 × 4.22 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Twinning Wisp, Feather, Needle, Indented Natural
Top View
6.86 mm6.81 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6512424390
Side View
Table 60.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.7%

Caratlytics Score

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

Price History

Last verified: Nov 5
Current: $4,410 USD|Low: $3,370 USD|High: $7,237 USD|Avg: $4,651 USD|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5$3,885 USD
Retailer 2$3,977 USD
Retailer 7$4,044 USD
Retailer 9$4,164 USD
Retailer 10$4,381 USD
Retailer 1$4,410 USD
Retailer 8$4,673 USD
Retailer 4$4,925 USD
Retailer 3$5,345 USD
Retailer 6$7,151 USD

45 data points across 10 retailers

17 retailers$3,856 USD to $7,633 USD

B+
Cheapest Retailer
-
$3,856 USD
B+
Retailer 2
-
$3,885 USD
View
B+
Retailer 3
-
$3,977 USD
View
B+
Retailer 4
-
$4,044 USD
View
Final sale: no returns
B+
Retailer 5
-
$4,155 USD
View
Retailer 6
-
$4,381 USD
View
Price last confirmed 8 days ago
B
Retailer 7
-
$4,381 USD
View
B
Retailer 8
-
$4,381 USD
View
B+
Retailer 9
-
$4,410 USD
View
B
Retailer 10
-
$4,529 USD
View
Retailer 11
-
$4,673 USD
View
Price last confirmed 28 days ago
B
Retailer 12
-
$4,925 USD
View
B
Retailer 13
-
$5,055 USD
View
B
Retailer 14
-
$5,345 USD
View
B
Retailer 15
-
$6,961 USD
View
B
Retailer 16
-
$7,151 USD
View
Most Expensive
B
NZ Jewellers
26c924ad-4a91-43a5-8d77-a32aea1d223a · Nov 5
$7,633 USD
View
16 more retailers have this diamond
Prices start from $3,856 USDSave up to $3,777 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
$3,856 USD