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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2556873938

Certificate GIA 2556873938

Diamond specifications and retailer prices

From $3,415 NZD
As of November 5, 2026
Save $2,246 NZD (40%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $8,015 NZD at Helzberg Diamonds · As of September 27, 2026
View at Helzberg Diamonds

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556873938. Listed at 15 retailers as of November 5, 2026, with a 66% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556873938
Dimensions6.75 × 6.79 × 4.24 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.75 mm6.79 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556873938
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°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 5
Current: $3,750 NZD|Low: $3,415 NZD|High: $6,085 NZD|Avg: $4,209 NZD|-7.6%
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
November 7, 2026
Retailer 14$3,415 NZD
Retailer 7$3,422 NZD
Retailer 9$3,436 NZD
Retailer 11$3,451 NZD
Retailer 12$3,463 NZD
Retailer 8$3,532 NZD
Retailer 1$3,750 NZD
Retailer 5$3,758 NZD
Retailer 3$4,113 NZD
Retailer 10$4,364 NZD
Retailer 4$4,411 NZD
Retailer 6$5,211 NZD
Retailer 13$5,262 NZD
Retailer 2$5,661 NZD

37 data points across 14 retailers

15 retailers$3,415 NZD to $5,661 NZD

A
Cheapest Retailer
-
$3,415 NZD
A
Retailer 2
-
$3,422 NZD
View
A
Retailer 3
-
$3,436 NZD
View
A
Retailer 4
-
$3,451 NZD
View
A
Retailer 5
-
$3,463 NZD
View
A
Retailer 6
-
$3,532 NZD
View
A
Retailer 7
-
$3,750 NZD
View
A
Retailer 8
-
$3,758 NZD
View
B+
Retailer 9
-
$4,113 NZD
View
B+
Retailer 10
-
$4,364 NZD
View
B+
Retailer 11
-
$4,411 NZD
View
B+
Retailer 12
-
$4,512 NZD
View
B+
Retailer 13
-
$5,262 NZD
View
B+
Retailer 14
-
$5,661 NZD
View
Most Expensive
Helzberg Diamonds
XZRILLKOOLOHO · Sep 27
$8,015 NZD
$4,443 USD
View
Price last confirmed 40 days ago
14 more retailers have this diamond
Prices start from $3,415 NZDSave up to $2,246 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
$3,415 NZD