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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 $5,148 NZD
As of November 6, 2026
Save $8,936 NZD (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $14,085 NZD 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 $5,148 to $14,085, a $8,936 spread on the same certified stone. Diamond Quarter lists it at $14,085. 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: $6,927 NZD|Low: $5,148 NZD|High: $11,991 NZD|Avg: $8,190 NZD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 10$5,148 NZD
Retailer 11$6,352 NZD
Retailer 5$6,478 NZD
Retailer 4$6,584 NZD
Retailer 1$6,927 NZD
Retailer 2$7,371 NZD
Retailer 8$7,914 NZD
Retailer 6$7,995 NZD
Retailer 7$8,399 NZD
Retailer 9$11,509 NZD
Retailer 3$11,991 NZD

37 data points across 11 retailers

24 retailers$5,148 NZD to $14,085 NZD

A
Cheapest Retailer
-
$5,148 NZD
B+
Retailer 2
-
$6,110 NZD
View
B+
Retailer 3
-
$6,209 NZD
View
B+
Retailer 4
-
$6,352 NZD
View
Final sale: no returns
B+
Retailer 5
-
$6,478 NZD
View
B+
Retailer 6
-
$6,516 NZD
View
Retailer 7
-
$6,528 NZD
View
Price last confirmed 118 days ago
B+
Retailer 8
-
$6,584 NZD
View
B+
Retailer 9
-
$6,584 NZD
View
Retailer 10
-
$6,882 NZD
View
Price last confirmed 40 days ago
B
Retailer 11
-
$6,882 NZD
View
Retailer 12
-
$6,882 NZD
View
Price last confirmed 13 days ago
B+
Retailer 13
-
$6,927 NZD
View
B+
Retailer 14
-
$7,145 NZD
View
B+
Retailer 15
-
$7,147 NZD
View
Retailer 16
-
$7,371 NZD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
$7,914 NZD
View
Retailer 18
-
$7,941 NZD
View
Price last confirmed 40 days ago
B+
Retailer 19
-
$7,995 NZD
View
B
Retailer 20
-
$8,399 NZD
View
B
Retailer 21
-
$11,509 NZD
View
Retailer 22
-
$11,991 NZD
View
Price last confirmed 42 days ago
B
Retailer 23
-
$11,991 NZD
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
$14,085 NZD
£6,148 GBP
View
23 more retailers have this diamond
Prices start from $5,148 NZDSave up to $8,936 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
$5,148 NZD