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Radiant|Natural|GIA

1.21ct E SI1 Radiant Natural Diamond

ID • E/SI1 • GIA 6551135368

Certificate GIA 6551135368

Diamond specifications and retailer prices

From $5,561 AUD
As of November 7, 2026
Save $4,634 AUD (45%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $10,642 AUD at NZ Jewellers · As of September 27, 2026
View at NZ Jewellers

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551135368. Listed at 11 retailers as of November 2, 2026, with a 83% 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
E
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle49.79°
Pavilion angle35.87°
OriginNatural
Grading LabGIA
CertificateGIA 6551135368
Dimensions7.10 × 5.43 × 3.66 mm
L/W Ratio1.31
Top View
7.10 mm5.43 mm1.21 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551135368
Side View
Table 70.0%Crown 49.79°Girdle: Slightly ThickPavilion 35.87°Culet: NoneDepth 67.5%

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 7
Current: $5,561 AUD|Low: $5,513 AUD|High: $10,338 AUD|Avg: $6,953 AUD|-0.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 7, 2026
Retailer 1$5,561 AUD
Retailer 5$5,945 AUD
Retailer 3$5,967 AUD
Retailer 6$6,549 AUD
Retailer 2$6,877 AUD
Retailer 4$10,195 AUD

40 data points across 6 retailers

11 retailers$5,561 AUD to $10,195 AUD

B+
Cheapest Retailer
-
$5,561 AUD
B+
Retailer 2
-
$5,945 AUD
View
B+
Retailer 3
-
$5,967 AUD
View
Retailer 4
-
$6,097 AUD
View
Price last confirmed 31 days ago
Retailer 5
-
$6,108 AUD
View
Price last confirmed 38 days ago
Retailer 6
-
$6,139 AUD
View
Price last confirmed 42 days ago
Retailer 7
-
$6,549 AUD
View
Price last confirmed 34 days ago
B+
Retailer 8
-
$6,877 AUD
View
B
Retailer 9
-
$10,195 AUD
View
Retailer 10
-
$10,622 AUD
View
Price last confirmed 32 days ago
Most Expensive
NZ Jewellers
ad612be8-176a-4851-b448-99a73f1d5545 · Sep 27
$10,642 AUD
$7,312 USD
View
Price last confirmed 40 days ago
10 more retailers have this diamond
Prices start from $5,561 AUDSave up to $4,634 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 Radiant
$5,561 AUD