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Round|Natural|GIA

1.21ct F SI2 Round Natural Diamond

EX • F/SI2 • GIA 5136012626

Certificate GIA 5136012626

Diamond specifications and retailer prices

From $10,988 AUD
As of November 4, 2026
Save $4,520 AUD (29%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $21,951 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 F colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5136012626. Listed at 19 retailers as of November 4, 2026, with a 41% 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
F
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5136012626
Dimensions6.92 × 6.91 × 4.20 mm
L/W Ratio1.00
Top View
6.92 mm6.91 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5136012626
Side View
Table 57.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 60.7%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $12,797 AUD|Low: $9,991 AUD|High: $23,979 AUD|Avg: $14,595 AUD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 13$10,988 AUD
Retailer 4$11,259 AUD
Retailer 2$11,617 AUD
Retailer 10$11,990 AUD
Retailer 3$12,106 AUD
Retailer 15$12,407 AUD
Retailer 1$12,797 AUD
Retailer 9$13,378 AUD
Retailer 7$13,441 AUD
Retailer 5$13,647 AUD
Retailer 6$14,670 AUD
Retailer 8$14,670 AUD
Retailer 18$14,766 AUD
Retailer 14$15,151 AUD
Retailer 11$15,325 AUD
Retailer 17$15,509 AUD
Retailer 12$19,323 AUD
Retailer 16$20,678 AUD

37 data points across 18 retailers

19 retailers$10,988 AUD to $15,509 AUD

B
Cheapest Retailer
-
$10,988 AUD
B
Retailer 2
-
$11,259 AUD
View
B
Retailer 3
-
$11,617 AUD
View
B
Retailer 4
-
$11,990 AUD
View
Final sale: no returns
B
Retailer 5
-
$12,106 AUD
View
Retailer 6
-
$12,407 AUD
View
Price last confirmed 9 days ago
Retailer 7
-
$12,797 AUD
View
Retailer 8
-
$13,378 AUD
View
Price last confirmed 16 days ago
B
Retailer 9
-
$13,441 AUD
View
B
Retailer 10
-
$13,647 AUD
View
B
Retailer 11
-
$14,670 AUD
View
B
Retailer 12
-
$14,670 AUD
View
B
Retailer 13
-
$14,766 AUD
View
B
Retailer 14
-
$15,151 AUD
View
B
Retailer 15
-
$15,325 AUD
View
B
Retailer 16
-
$15,509 AUD
View
Retailer 17
-
$19,323 AUD
View
Price under review
Retailer 18
-
$20,678 AUD
View
Price under review
Most Expensive
Diamond Quarter
1.21SI2F5126EA3DN · Nov 5
$21,951 AUD
£11,876 GBP
View
Price under review
18 more retailers have this diamond
Prices start from $10,988 AUDSave up to $4,520 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
$10,988 AUD