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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6545694423

Certificate GIA 6545694423

Diamond specifications and retailer prices

From $8,159 AUD
As of November 6, 2026
Save $10,441 AUD (56%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $18,600 AUD at NZ Jewellers · As of November 7, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6545694423. Listed at 24 retailers as of November 6, 2026, with prices from $8,159 to $18,600, a $10,441 spread on the same certified stone. NZ Jewellers lists it at $18,600. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6545694423
Dimensions7.33 × 7.35 × 4.52 mm
L/W Ratio1.00
Top View
7.33 mm7.35 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6545694423
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.6%

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: $18,600 AUD|Low: $8,085 AUD|High: $18,600 AUD|Avg: $11,449 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
Retailer 20
Retailer 21
Retailer 22
Retailer 23
November 7, 2026
Retailer 5$8,159 AUD
Retailer 12$8,786 AUD
Retailer 10$9,300 AUD
Retailer 15$9,300 AUD
Retailer 7$9,336 AUD
Retailer 2$9,741 AUD
Retailer 9$10,076 AUD
Retailer 14$10,230 AUD
Retailer 21$10,312 AUD
Retailer 20$10,691 AUD
Retailer 6$10,722 AUD
Retailer 4$11,013 AUD
Retailer 11$11,626 AUD
Retailer 18$11,813 AUD
Retailer 16$12,254 AUD
Retailer 17$12,336 AUD
Retailer 8$12,473 AUD
Retailer 13$12,997 AUD
Retailer 19$13,492 AUD
Retailer 22$13,492 AUD
Retailer 23$13,569 AUD
Retailer 3$15,458 AUD
NZ Jewellers$18,600 AUD

31 data points across 23 retailers

24 retailers$8,159 AUD to $18,600 AUD

A
Cheapest Retailer
-
$8,159 AUD
B+
Retailer 2
-
$8,779 AUD
View
B+
Retailer 3
-
$8,786 AUD
View
B+
Retailer 4
-
$9,300 AUD
View
Final sale: no returns
B+
Retailer 5
-
$9,300 AUD
View
B+
Retailer 6
-
$9,336 AUD
View
B+
Retailer 7
-
$9,741 AUD
View
B+
Retailer 8
-
$10,076 AUD
View
B+
Retailer 9
-
$10,230 AUD
View
B+
Retailer 10
-
$10,312 AUD
View
B
Retailer 11
-
$10,691 AUD
View
Retailer 12
-
$10,722 AUD
View
Price last confirmed 16 days ago
B+
Retailer 13
-
$11,013 AUD
View
B+
Retailer 14
-
$11,626 AUD
View
B
Retailer 15
-
$11,813 AUD
View
Retailer 16
-
$12,254 AUD
View
Price last confirmed 15 days ago
B+
Retailer 17
-
$12,336 AUD
View
B
Retailer 18
-
$12,473 AUD
View
B
Retailer 19
-
$12,997 AUD
View
B
Retailer 20
-
$13,492 AUD
View
B
Retailer 21
-
$13,492 AUD
View
B
Retailer 22
-
$13,569 AUD
View
B
Retailer 23
-
$15,458 AUD
View
Most Expensive
B
NZ Jewellers
7238d773-89f0-446b-9262-05b231d63538 · Nov 7
$18,600 AUD
$12,780 USD
View
23 more retailers have this diamond
Prices start from $8,159 AUDSave up to $10,441 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 Round
$8,159 AUD