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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 $5,612 AUD
As of November 5, 2026
Save $5,497 AUD (49%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $11,109 AUD 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 $5,612 to $11,109, a $5,497 spread on the same certified stone. NZ Jewellers lists it at $11,109. 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 angle34.5°
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: $6,418 AUD|Low: $4,905 AUD|High: $10,533 AUD|Avg: $6,771 AUD|+1.4%
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$5,654 AUD
Retailer 2$5,788 AUD
Retailer 7$5,886 AUD
Retailer 9$6,060 AUD
Retailer 10$6,376 AUD
Retailer 1$6,418 AUD
Retailer 8$6,801 AUD
Retailer 4$7,168 AUD
Retailer 3$7,779 AUD
Retailer 6$10,408 AUD

44 data points across 10 retailers

17 retailers$5,612 AUD to $11,109 AUD

B+
Cheapest Retailer
-
$5,612 AUD
B+
Retailer 2
-
$5,654 AUD
View
B+
Retailer 3
-
$5,788 AUD
View
B+
Retailer 4
-
$5,886 AUD
View
Final sale: no returns
B+
Retailer 5
-
$6,047 AUD
View
Retailer 6
-
$6,376 AUD
View
Price last confirmed 9 days ago
B
Retailer 7
-
$6,376 AUD
View
B
Retailer 8
-
$6,376 AUD
View
B+
Retailer 9
-
$6,418 AUD
View
B
Retailer 10
-
$6,592 AUD
View
Retailer 11
-
$6,801 AUD
View
Price last confirmed 29 days ago
B
Retailer 12
-
$7,168 AUD
View
B
Retailer 13
-
$7,357 AUD
View
B
Retailer 14
-
$7,779 AUD
View
B
Retailer 15
-
$10,131 AUD
View
B
Retailer 16
-
$10,408 AUD
View
Most Expensive
B
NZ Jewellers
26c924ad-4a91-43a5-8d77-a32aea1d223a · Nov 5
$11,109 AUD
$7,633 USD
View
16 more retailers have this diamond
Prices start from $5,612 AUDSave up to $5,497 AUD

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
$5,612 AUD