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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6555735876

Certificate GIA 6555735876

Diamond specifications and retailer prices

From $8,747 AUD
HK$48,000 HKD
As of November 1, 2026
Save $11,131 AUD (56%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $19,878 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 6555735876. Listed at 20 retailers as of October 30, 2026, with prices from $8,747 to $19,878, a $11,131 spread on the same certified stone. NZ Jewellers lists it at $19,878. 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°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6555735876
Dimensions7.25 × 7.29 × 4.55 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.25 mm7.29 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555735876
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.6%

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: $19,878 AUD|Low: $8,674 AUD|High: $19,878 AUD|Avg: $12,185 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 16$8,747 AUD
Retailer 7$9,390 AUD
Retailer 9$9,937 AUD
Retailer 5$9,940 AUD
Retailer 18$9,944 AUD
Retailer 3$10,767 AUD
Retailer 8$10,933 AUD
Retailer 13$11,142 AUD
Retailer 17$11,397 AUD
Retailer 12$11,830 AUD
Retailer 4$11,873 AUD
Retailer 10$11,873 AUD
Retailer 19$12,271 AUD
Retailer 6$12,424 AUD
Retailer 11$13,091 AUD
Retailer 2$13,170 AUD
Retailer 15$14,601 AUD
Retailer 14$16,563 AUD
NZ Jewellers$19,878 AUD

35 data points across 19 retailers

20 retailers$8,747 AUD to $19,878 AUD

B+
Cheapest Retailer
-
$8,747 AUD
HK$48,000 HKD
B+
Retailer 2
-
$8,929 AUD
View
B+
Retailer 3
-
$9,390 AUD
$6,596 USD
View
B+
Retailer 4
-
$9,937 AUD
$6,980 USD
View
Final sale: no returns
B+
Retailer 5
-
$9,940 AUD
$6,982 USD
View
B+
Retailer 6
-
$9,944 AUD
$6,985 USD
View
B
Retailer 7
-
$10,767 AUD
$7,563 USD
View
B+
Retailer 8
-
$10,933 AUD
$7,680 USD
View
B+
Retailer 9
-
$11,142 AUD
£6,163 GBP
View
Retailer 10
-
$11,397 AUD
View
Price last confirmed 11 days ago
B+
Retailer 11
-
$11,830 AUD
€7,914 EUR
View
B
Retailer 12
-
$11,873 AUD
$8,340 USD
View
B
Retailer 13
-
$11,873 AUD
$8,340 USD
View
B
Retailer 14
-
$12,271 AUD
$8,620 USD
View
B
Retailer 15
-
$12,424 AUD
$8,727 USD
View
Retailer 16
-
$13,091 AUD
$9,196 USD
View
Price last confirmed 10 days ago
B
Retailer 17
-
$13,170 AUD
£7,284 GBP
View
B
Retailer 18
-
$14,601 AUD
ZAR 165,691 ZAR
View
B
Retailer 19
-
$16,563 AUD
£9,161 GBP
View
Most Expensive
B
NZ Jewellers
709b4404-daec-4c0b-b654-fb474c7a1d60 · Oct 30
$19,878 AUD
$13,963 USD
View
19 more retailers have this diamond
Prices start from $8,747 AUDSave up to $11,131 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
$8,747 AUD