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Heart|Natural|GIA

1.51ct I SI2 Heart Natural Diamond

EX • I/SI2 • GIA 2427009307

Certificate GIA 2427009307

Diamond specifications and retailer prices

From $5,228 AUD
As of October 31, 2026
Save $8,629 AUD (62%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $13,857 AUD at Adiamor · As of November 5, 2026
View at Adiamor

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2427009307. Listed at 15 retailers as of October 31, 2026, with prices from $5,228 to $13,857, a $8,629 spread on the same certified stone. Adiamor lists it at $13,857. 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

1.51
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2427009307
Dimensions6.57 × 8.10 × 4.46 mm
L/W Ratio1.23
Top View
6.57 mm8.10 mm1.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2427009307
Side View
Table 62.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 55.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $12,431 AUD|Low: $4,986 AUD|High: $12,431 AUD|Avg: $7,024 AUD|+118.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5$5,228 AUD
Retailer 6$5,234 AUD
Retailer 4$6,092 AUD
Retailer 7$6,654 AUD
Retailer 2$7,098 AUD
Retailer 8$7,210 AUD
Retailer 3$11,451 AUD
Retailer 1$12,431 AUD

42 data points across 8 retailers

15 retailers$5,228 AUD to $13,857 AUD

A
Cheapest Retailer
-
$5,228 AUD
A
Retailer 2
-
$5,234 AUD
View
A
Retailer 3
-
$6,092 AUD
View
B+
Retailer 4
-
$6,156 AUD
View
B+
Retailer 5
-
$6,654 AUD
View
Final sale: no returns
B+
Retailer 6
-
$7,098 AUD
View
B+
Retailer 7
-
$7,210 AUD
View
B+
Retailer 8
-
$7,210 AUD
View
Retailer 9
-
$7,210 AUD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
$7,430 AUD
View
B
Retailer 11
-
$8,319 AUD
View
B
Retailer 12
-
$11,451 AUD
View
B
Retailer 13
-
$12,431 AUD
View
B
Retailer 14
-
$12,560 AUD
View
Most Expensive
B
Adiamor
D-64680553 · Nov 5
$13,857 AUD
$9,521 USD
View
14 more retailers have this diamond
Prices start from $5,228 AUDSave up to $8,629 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.

A
1.51ct Heart
$5,228 AUD