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Round|Natural|GIA

1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2554628290

Certificate GIA 2554628290

Diamond specifications and retailer prices

From $9,499 AUD
As of November 6, 2026
Save $8,737 AUD (48%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $18,236 AUD at NZ Jewellers · As of November 2, 2026
View at NZ Jewellers

About this 1.55ct natural round diamond

This 1.55ct 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 2554628290. Listed at 10 retailers as of November 2, 2026, with prices from $9,499 to $18,236, a $8,737 spread on the same certified stone. NZ Jewellers lists it at $18,236. 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

1.55
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2554628290
Dimensions7.34 × 7.39 × 4.62 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
7.34 mm7.39 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2554628290
Side View
Table 58.0%Crown 34.5°Girdle: STK-STKPavilion 41.6°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 6
Current: $18,236 AUD|Low: $8,681 AUD|High: $18,236 AUD|Avg: $11,529 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
November 6, 2026
Retailer 3$8,681 AUD
Retailer 7$9,499 AUD
Retailer 13$9,515 AUD
Retailer 9$10,071 AUD
Retailer 10$10,904 AUD
Retailer 8$10,932 AUD
Retailer 2$11,016 AUD
Retailer 5$11,873 AUD
Retailer 12$12,206 AUD
Retailer 6$12,272 AUD
Retailer 4$13,826 AUD
Retailer 11$15,352 AUD
NZ Jewellers$18,236 AUD

14 data points across 13 retailers

10 retailers$9,499 AUD to $18,236 AUD

Retailer 1
-
$8,681 AUD
Price last confirmed 19 days ago
B+
Retailer 2
-
$9,499 AUD
View
B+
Retailer 3
-
$10,071 AUD
View
B+
Retailer 4
-
$10,904 AUD
View
B+
Retailer 5
-
$10,932 AUD
View
B
Retailer 6
-
$11,016 AUD
View
B
Retailer 7
-
$12,206 AUD
View
B+
Retailer 8
-
$12,272 AUD
View
B
Retailer 9
-
$15,352 AUD
View
Most Expensive
B
NZ Jewellers
487b5f42-6e04-4b45-8b32-98f9a897b104 · Nov 2
$18,236 AUD
$12,530 USD
View
9 more retailers have this diamond
Prices start from $9,499 AUDSave up to $8,737 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+
1.55ct Round
$9,499 AUD