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Heart|Natural|GIA

1.23ct G SI1 Heart Natural Diamond

ID • G/SI1 • GIA 1232913295

Certificate GIA 1232913295

Diamond specifications and retailer prices

From $4,383 NZD
As of November 1, 2026
Save $5,368 NZD (55%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $10,116 NZD at NZ Jewellers · As of October 21, 2026
View at NZ Jewellers

About this 1.23ct natural heart diamond

This 1.23ct natural heart sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1232913295. Listed at 16 retailers as of November 1, 2026, with a 122% 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

1.23
Carat
G
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1232913295
Dimensions6.43 × 7.34 × 4.39 mm
L/W Ratio1.14
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal, Feather
Top View
6.43 mm7.34 mm1.23 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1232913295
Side View
Table 58.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 59.9%

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: $10,116 NZD|Low: $4,383 NZD|High: $10,116 NZD|Avg: $6,147 NZD
NZ Jewellers
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
November 7, 2026
Retailer 13$4,383 NZD
Retailer 9$4,510 NZD
Retailer 15$4,553 NZD
Retailer 16$5,260 NZD
Retailer 8$5,444 NZD
Retailer 14$5,462 NZD
Retailer 3$5,574 NZD
Retailer 10$5,688 NZD
Retailer 4$5,733 NZD
Retailer 6$6,043 NZD
Retailer 7$6,043 NZD
Retailer 17$6,070 NZD
Retailer 5$6,241 NZD
Retailer 11$6,824 NZD
Retailer 12$7,156 NZD
Retailer 2$9,752 NZD
NZ Jewellers$10,116 NZD

32 data points across 17 retailers

16 retailers$4,383 NZD to $9,752 NZD

A
Cheapest Retailer
-
$4,383 NZD
B+
Retailer 2
-
$4,553 NZD
View
Retailer 3
-
$5,260 NZD
View
Price last confirmed 16 days ago
Retailer 4
-
$5,462 NZD
View
Price last confirmed 16 days ago
B+
Retailer 5
-
$5,574 NZD
View
B+
Retailer 6
-
$5,688 NZD
View
B+
Retailer 7
-
$5,733 NZD
View
B+
Retailer 8
-
$6,043 NZD
View
B+
Retailer 9
-
$6,043 NZD
View
Retailer 10
-
$6,070 NZD
View
Price last confirmed 53 days ago
Retailer 11
-
$6,070 NZD
View
Price last confirmed 15 days ago
B+
Retailer 12
-
$6,241 NZD
View
B+
Retailer 13
-
$6,824 NZD
View
B
Retailer 14
-
$7,156 NZD
View
B
Retailer 15
-
$9,752 NZD
View
Most Expensive
NZ Jewellers
bdcd893b-9df2-49a8-b8b8-b0fae6f44362 · Oct 21
$10,116 NZD
$5,608 USD
View
Price last confirmed 16 days ago
15 more retailers have this diamond
Prices start from $4,383 NZDSave up to $5,368 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
1.23ct Heart
$4,383 NZD