Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6455803337

Certificate GIA 6455803337

Diamond specifications and retailer prices

From $5,589 AUD
As of November 6, 2026
Save $6,624 AUD (54%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $16,833 AUD 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $6,858 AUD|Low: $5,589 AUD|High: $11,298 AUD|Avg: $7,374 AUD|+1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 8$5,589 AUD
Retailer 5$5,632 AUD
Retailer 7$6,025 AUD
Retailer 9$6,350 AUD
Retailer 1$6,858 AUD
Retailer 6$7,066 AUD
Retailer 3$7,880 AUD
Retailer 2$8,552 AUD
Retailer 4$11,134 AUD

44 data points across 9 retailers

15 retailers$5,589 AUD to $12,212 AUD

B+
Cheapest Retailer
-
$5,589 AUD
B+
Retailer 2
-
$5,632 AUD
View
B+
Retailer 3
-
$6,025 AUD
View
B+
Retailer 4
-
$6,350 AUD
View
Retailer 5
-
$6,350 AUD
View
Price last confirmed 9 days ago
B+
Retailer 6
-
$6,350 AUD
View
B+
Retailer 7
-
$6,858 AUD
View
Retailer 8
-
$7,066 AUD
View
Price last confirmed 29 days ago
B
Retailer 9
-
$7,328 AUD
View
Retailer 10
-
$7,740 AUD
View
Price last confirmed 15 days ago
B
Retailer 11
-
$7,880 AUD
View
B
Retailer 12
-
$8,552 AUD
View
B
Retailer 13
-
$11,134 AUD
View
B
Retailer 14
-
$12,212 AUD
View
Most Expensive
Diamond Quarter
1.21SI1H64372F45N · Nov 5
$16,833 AUD
£9,107 GBP
View
Price under review
14 more retailers have this diamond
Prices start from $5,589 AUDSave up to $6,624 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
$5,589 AUD