Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6501035788

Shape and cutting style on the report: Round

Certificate GIA 6501035788

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)
16 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 6501035788. Listed at 16 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 angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6501035788
Dimensions6.85 × 6.84 × 4.21 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.85 mm6.84 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6501035788
Side View
Table 58.0%Crown 35°Girdle: MediumPavilion 41°Culet: NoneDepth 61.6%

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: $4,884 AUD|High: $11,298 AUD|Avg: $7,305 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 5$5,632 AUD
Retailer 6$5,862 AUD
Retailer 9$6,025 AUD
Retailer 8$6,350 AUD
Retailer 1$6,858 AUD
Retailer 7$7,066 AUD
Retailer 2$7,872 AUD
Retailer 3$8,552 AUD
Retailer 4$11,134 AUD

44 data points across 9 retailers

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

B+
Cheapest Retailer
-
$5,589 AUD
B+
Retailer 2
-
$5,632 AUD
View
B+
Retailer 3
-
$5,862 AUD
View
Final sale: no returns
B+
Retailer 4
-
$6,025 AUD
View
B+
Retailer 5
-
$6,350 AUD
View
Retailer 6
-
$6,350 AUD
View
Price last confirmed 9 days ago
B+
Retailer 7
-
$6,350 AUD
View
B+
Retailer 8
-
$6,858 AUD
View
Retailer 9
-
$7,066 AUD
View
Price last confirmed 29 days ago
B
Retailer 10
-
$7,328 AUD
View
Retailer 11
-
$7,740 AUD
View
Price last confirmed 15 days ago
B
Retailer 12
-
$7,872 AUD
View
B
Retailer 13
-
$8,552 AUD
View
B
Retailer 14
-
$11,134 AUD
View
B
Retailer 15
-
$12,212 AUD
View
Most Expensive
Diamond Quarter
1.21SI1H65885B7EN · Nov 5
$16,833 AUD
£9,107 GBP
View
Price under review
15 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