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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1499381589

Certificate GIA 1499381589

Diamond specifications and retailer prices

From $10,878 AUD
$7,641 USD
As of November 1, 2026
Save $12,357 AUD (53%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $23,235 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1499381589. Listed at 19 retailers as of October 30, 2026, with prices from $10,878 to $23,235, a $12,357 spread on the same certified stone. NZ Jewellers lists it at $23,235. 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 angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1499381589
Dimensions7.30 × 7.28 × 4.57 mm
L/W Ratio1.00
Star length55%
Lower girdle75%
Cert comments
Additional clouds are not shown. Pinpoints are not shown.
Key to symbols
Feather, Cloud
Top View
7.30 mm7.28 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1499381589
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.7%

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: $15,394 AUD|Low: $11,618 AUD|High: $19,593 AUD|Avg: $14,761 AUD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7$11,618 AUD
Retailer 2$12,778 AUD
Retailer 8$12,780 AUD
Retailer 6$12,836 AUD
Retailer 4$15,114 AUD
Retailer 1$15,394 AUD
Retailer 5$17,067 AUD
Retailer 3$19,360 AUD

36 data points across 8 retailers

19 retailers$10,878 AUD to $23,235 AUD

Retailer 1
-
$9,952 AUD
$6,991 USD
Price last confirmed 70 days ago
B+
Retailer 2
-
$10,878 AUD
$7,641 USD
View
B+
Retailer 3
-
$11,560 AUD
$8,120 USD
View
B+
Retailer 4
-
$11,618 AUD
$8,161 USD
View
B
Retailer 5
-
$11,618 AUD
$8,161 USD
View
Final sale: no returns
B
Retailer 6
-
$12,586 AUD
$8,841 USD
View
B+
Retailer 7
-
$12,778 AUD
£7,067 GBP
View
B
Retailer 8
-
$12,780 AUD
$8,977 USD
View
Retailer 9
-
$12,836 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$13,766 AUD
$9,670 USD
View
B
Retailer 11
-
$13,766 AUD
$9,670 USD
View
B
Retailer 12
-
$14,222 AUD
$9,990 USD
View
B
Retailer 13
-
$14,522 AUD
$10,201 USD
View
B
Retailer 14
-
$15,114 AUD
€10,111 EUR
View
Retailer 15
-
$15,295 AUD
$10,744 USD
View
Price last confirmed 10 days ago
B
Retailer 16
-
$15,394 AUD
£8,514 GBP
View
B
Retailer 17
-
$17,067 AUD
ZAR 193,676 ZAR
View
B
Retailer 18
-
$19,360 AUD
£10,708 GBP
View
Most Expensive
B
NZ Jewellers
1689698a-db4d-4d37-997d-21b4358c82c3 · Oct 30
$23,235 AUD
$16,321 USD
View
18 more retailers have this diamond
Prices start from $10,878 AUDSave up to $12,357 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
$10,878 AUD