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Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2507471981

Certificate GIA 2507471981

Diamond specifications and retailer prices

From $4,154 AUD
As of November 6, 2026
Save $7,210 AUD (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $11,364 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 2507471981. Listed at 24 retailers as of November 5, 2026, with prices from $4,154 to $11,364, a $7,210 spread on the same certified stone. Diamond Quarter lists it at $11,364. 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
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $5,312 AUD|Low: $4,154 AUD|High: $9,674 AUD|Avg: $6,615 AUD|-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$4,154 AUD
Retailer 11$5,124 AUD
Retailer 4$5,226 AUD
Retailer 1$5,312 AUD
Retailer 5$5,555 AUD
Retailer 2$5,947 AUD
Retailer 8$6,385 AUD
Retailer 6$6,450 AUD
Retailer 7$6,776 AUD
Retailer 9$9,285 AUD
Retailer 3$9,674 AUD

36 data points across 11 retailers

24 retailers$4,154 AUD to $11,364 AUD

A
Cheapest Retailer
-
$4,154 AUD
B+
Retailer 2
-
$4,929 AUD
View
B+
Retailer 3
-
$5,009 AUD
View
B+
Retailer 4
-
$5,124 AUD
View
Final sale: no returns
B+
Retailer 5
-
$5,226 AUD
View
B+
Retailer 6
-
$5,257 AUD
View
Retailer 7
-
$5,267 AUD
View
Price last confirmed 118 days ago
B+
Retailer 8
-
$5,312 AUD
View
B+
Retailer 9
-
$5,312 AUD
View
Retailer 10
-
$5,552 AUD
View
Price last confirmed 40 days ago
B
Retailer 11
-
$5,552 AUD
View
Retailer 12
-
$5,552 AUD
View
Price last confirmed 13 days ago
B+
Retailer 13
-
$5,555 AUD
View
B+
Retailer 14
-
$5,765 AUD
View
B+
Retailer 15
-
$5,766 AUD
View
Retailer 16
-
$5,947 AUD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
$6,385 AUD
View
Retailer 18
-
$6,407 AUD
View
Price last confirmed 40 days ago
B+
Retailer 19
-
$6,450 AUD
View
B
Retailer 20
-
$6,776 AUD
View
B
Retailer 21
-
$9,285 AUD
View
Retailer 22
-
$9,674 AUD
View
Price last confirmed 42 days ago
B
Retailer 23
-
$9,674 AUD
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
$11,364 AUD
£6,148 GBP
View
23 more retailers have this diamond
Prices start from $4,154 AUDSave up to $7,210 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.

A
1.21ct Round
$4,154 AUD