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Heart|Natural|GIA

1.23ct D SI1 Heart Natural Diamond

VG • D/SI1 • GIA 6421591328

Certificate GIA 6421591328

Diamond specifications and retailer prices

From $5,682 AUD
As of November 6, 2026
Save $6,750 AUD (54%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $12,432 AUD at NZ Jewellers · As of November 5, 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 D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6421591328. Listed at 13 retailers as of November 5, 2026, with prices from $5,682 to $12,432, a $6,750 spread on the same certified stone. NZ Jewellers lists it at $12,432. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.23
Carat
D
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6421591328
Dimensions7.28 × 6.27 × 3.74 mm
L/W Ratio1.16
Top View
7.28 mm6.27 mm1.23 ctD / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421591328
Side View
Table 59.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 59.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $12,432 AUD|Low: $5,165 AUD|High: $12,432 AUD|Avg: $8,130 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 8$5,682 AUD
Retailer 2$7,089 AUD
Retailer 9$7,136 AUD
Retailer 10$7,136 AUD
Retailer 11$7,136 AUD
Retailer 6$7,139 AUD
Retailer 7$7,193 AUD
Retailer 3$8,233 AUD
Retailer 4$8,706 AUD
Retailer 5$11,061 AUD
NZ Jewellers$12,432 AUD

43 data points across 11 retailers

13 retailers$5,682 AUD to $12,432 AUD

B
Cheapest Retailer
-
$5,682 AUD
Final sale: no returns
B
Retailer 2
-
$7,089 AUD
View
Retailer 3
-
$7,136 AUD
View
Price last confirmed 9 days ago
B
Retailer 4
-
$7,136 AUD
View
B
Retailer 5
-
$7,136 AUD
View
B
Retailer 6
-
$7,139 AUD
View
Retailer 7
-
$7,193 AUD
View
Price last confirmed 29 days ago
B
Retailer 8
-
$7,233 AUD
View
B
Retailer 9
-
$7,356 AUD
View
B
Retailer 10
-
$8,233 AUD
View
B
Retailer 11
-
$8,706 AUD
View
B
Retailer 12
-
$11,061 AUD
View
Most Expensive
B
NZ Jewellers
8df258f0-f6e5-44b8-aada-89b0f87417ad · Nov 5
$12,432 AUD
$8,542 USD
View
12 more retailers have this diamond
Prices start from $5,682 AUDSave up to $6,750 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
1.23ct Heart
$5,682 AUD