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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1555561780

Certificate GIA 1555561780

Diamond specifications and retailer prices

From $8,162 AUD
HK$44,800 HKD
As of October 22, 2026
Save $1,380 AUD (14%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $11,648 AUD at The Perfect Carat · As of September 29, 2026
View at The Perfect Carat

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555561780. Listed at 6 retailers as of October 22, 2026, with a relatively tight 17% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1555561780
Dimensions7.24 × 7.29 × 4.56 mm
L/W Ratio1.01
Key to symbols
Crystal, Feather, Needle
Top View
7.24 mm7.29 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1555561780
Side View
Table 58.0%CrownGirdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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: Oct 22
Current: $9,291 AUD|Low: $8,162 AUD|High: $16,365 AUD|Avg: $10,839 AUD|-18.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 22, 2026
Retailer 5$8,162 AUD
Retailer 1$9,291 AUD
Retailer 6$9,515 AUD
Retailer 2$9,542 AUD
Retailer 3$12,208 AUD
Retailer 4$15,705 AUD

26 data points across 6 retailers

6 retailers$8,162 AUD to $9,542 AUD

A
Cheapest Retailer
-
$8,162 AUD
HK$44,800 HKD
A
Retailer 2
-
$9,291 AUD
€6,217 EUR
View
Price last confirmed 7 days ago
A
Retailer 3
-
$9,515 AUD
SGD 9,033 SGD
View
Price last confirmed 21 days ago
A
Retailer 4
-
$9,542 AUD
$6,704 USD
View
A
Retailer 5
-
$11,340 AUD
$7,967 USD
View
Price last confirmed 22 days ago
Most Expensive
B+
The Perfect Carat
tpc_f6a4e049-9738-4e80-b743-4f6da669d118 · Sep 29
$11,648 AUD
$8,183 USD
View
Price last confirmed 29 days ago
5 more retailers have this diamond
Prices start from $8,162 AUDSave up to $1,380 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
$8,162 AUD