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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6431629525

Certificate GIA 6431629525

Diamond specifications and retailer prices

From $5,071 NZD
As of November 1, 2026
Save $5,383 NZD (51%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $10,890 NZD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431629525. Listed at 23 retailers as of November 1, 2026, with a 106% 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6431629525
Dimensions6.84 × 6.80 × 4.23 mm
L/W Ratio1.01
Top View
6.84 mm6.80 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431629525
Side View
Table 56.0%Crown 35.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.1%

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 1
Current: $9,113 NZD|Low: $5,071 NZD|High: $10,793 NZD|Avg: $6,908 NZD|-2.9%
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 3, 2026
Retailer 15$5,071 NZD
Retailer 13$5,141 NZD
Retailer 16$5,188 NZD
Retailer 7$5,338 NZD
Retailer 9$5,699 NZD
Retailer 4$5,928 NZD
Retailer 3$6,196 NZD
Retailer 6$6,251 NZD
Retailer 17$6,440 NZD
Retailer 18$6,440 NZD
Retailer 12$6,492 NZD
Retailer 5$6,588 NZD
Retailer 2$6,656 NZD
Retailer 11$6,927 NZD
Retailer 8$7,437 NZD
Retailer 1$9,113 NZD
Retailer 14$10,454 NZD
Retailer 10$10,793 NZD

22 data points across 18 retailers

23 retailers$5,071 NZD to $10,454 NZD

A
Cheapest Retailer
-
$5,071 NZD
A
Retailer 2
-
$5,141 NZD
View
A
Retailer 3
-
$5,188 NZD
View
Retailer 4
-
$5,338 NZD
View
Price last confirmed 18 days ago
B+
Retailer 5
-
$5,699 NZD
View
B+
Retailer 6
-
$5,928 NZD
View
B+
Retailer 7
-
$6,196 NZD
View
Retailer 8
-
$6,251 NZD
View
Price last confirmed 56 days ago
Retailer 9
-
$6,251 NZD
View
Price last confirmed 21 days ago
Retailer 10
-
$6,251 NZD
View
Price last confirmed 19 days ago
B+
Retailer 11
-
$6,440 NZD
View
B+
Retailer 12
-
$6,440 NZD
View
Retailer 13
-
$6,490 NZD
View
Price last confirmed 22 days ago
B+
Retailer 14
-
$6,492 NZD
View
B+
Retailer 15
-
$6,588 NZD
View
B
Retailer 16
-
$6,656 NZD
View
B
Retailer 17
-
$6,927 NZD
View
Retailer 18
-
$7,212 NZD
View
Price last confirmed 60 days ago
Retailer 19
-
$7,212 NZD
View
Price last confirmed 19 days ago
B
Retailer 20
-
$9,113 NZD
View
B
Retailer 21
-
$10,454 NZD
View
Retailer 22
-
$10,890 NZD
View
Price last confirmed 57 days ago
Most Expensive
NZ Jewellers
ed3d6f6b-3ec0-4861-8c13-5b12bee53f86 · Oct 17
$10,890 NZD
$6,037 USD
View
Price last confirmed 20 days ago
22 more retailers have this diamond
Prices start from $5,071 NZDSave up to $5,383 NZD

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
$5,071 NZD