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Round|Natural|GIA

1.51ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6425906823

Certificate GIA 6425906823

Diamond specifications and retailer prices

From $6,833 AUD
HK$37,500 HKD
As of November 1, 2026
Save $8,694 AUD (56%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $15,527 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6425906823. Listed at 19 retailers as of October 30, 2026, with prices from $6,833 to $15,527, a $8,694 spread on the same certified stone. NZ Jewellers lists it at $15,527. 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6425906823
Dimensions7.31 × 7.27 × 4.55 mm
L/W Ratio1.01
Top View
7.31 mm7.27 mm1.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6425906823
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $15,527 AUD|Low: $6,718 AUD|High: $15,527 AUD|Avg: $9,643 AUD
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
Retailer 18
Retailer 19
November 2, 2026
Retailer 15$6,833 AUD
Retailer 18$7,346 AUD
Retailer 5$7,763 AUD
Retailer 16$7,830 AUD
Retailer 6$8,411 AUD
Retailer 8$8,411 AUD
Retailer 19$8,411 AUD
Retailer 2$8,772 AUD
Retailer 7$9,382 AUD
Retailer 9$9,382 AUD
Retailer 11$9,384 AUD
Retailer 10$9,508 AUD
Retailer 17$9,695 AUD
Retailer 3$9,705 AUD
Retailer 12$10,099 AUD
Retailer 4$10,234 AUD
Retailer 14$11,406 AUD
Retailer 13$13,677 AUD
NZ Jewellers$15,527 AUD

43 data points across 19 retailers

19 retailers$6,833 AUD to $15,527 AUD

B+
Cheapest Retailer
-
$6,833 AUD
HK$37,500 HKD
B+
Retailer 2
-
$7,346 AUD
$5,160 USD
View
B
Retailer 3
-
$7,763 AUD
$5,453 USD
View
Final sale: no returns
B
Retailer 4
-
$7,830 AUD
$5,500 USD
View
B
Retailer 5
-
$8,411 AUD
$5,908 USD
View
B
Retailer 6
-
$8,411 AUD
$5,908 USD
View
B
Retailer 7
-
$8,411 AUD
$5,908 USD
View
B+
Retailer 8
-
$8,772 AUD
£4,852 GBP
View
B
Retailer 9
-
$9,382 AUD
$6,590 USD
View
B
Retailer 10
-
$9,382 AUD
$6,590 USD
View
Retailer 11
-
$9,384 AUD
View
Price last confirmed 29 days ago
B
Retailer 12
-
$9,508 AUD
$6,679 USD
View
B
Retailer 13
-
$9,695 AUD
$6,810 USD
View
B
Retailer 14
-
$9,705 AUD
$6,817 USD
View
B
Retailer 15
-
$10,099 AUD
€6,756 EUR
View
Retailer 16
-
$10,234 AUD
$7,189 USD
View
Price last confirmed 10 days ago
B
Retailer 17
-
$11,406 AUD
ZAR 129,441 ZAR
View
B
Retailer 18
-
$13,677 AUD
£7,565 GBP
View
Most Expensive
B
NZ Jewellers
69390dd0-34a5-44b5-99bc-6831c853a27d · Oct 30
$15,527 AUD
$10,907 USD
View
18 more retailers have this diamond
Prices start from $6,833 AUDSave up to $8,694 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+
1.51ct Round
$6,833 AUD