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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2231916633

Certificate GIA 2231916633

Diamond specifications and retailer prices

From $3,855 AUD
As of November 6, 2026
Save $4,937 AUD (56%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $9,406 AUD at NZ Jewellers · As of October 14, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2231916633. Listed at 9 retailers as of November 4, 2026, with a 128% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2231916633
Dimensions7.35 × 7.39 × 4.47 mm
L/W Ratio1.01
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.35 mm7.39 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2231916633
Side View
Table 58.0%CrownGirdle: MED-STKPavilion 40.6°Culet: NoneDepth 60.6%

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: $6,059 AUD|Low: $3,855 AUD|High: $9,245 AUD|Avg: $5,671 AUD|-1.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2$3,855 AUD
Retailer 7$4,512 AUD
Retailer 6$4,698 AUD
Retailer 4$5,349 AUD
Retailer 3$5,670 AUD
Retailer 1$6,059 AUD
Retailer 5$8,792 AUD

33 data points across 7 retailers

9 retailers$3,855 AUD to $8,792 AUD

A
Cheapest Retailer
-
$3,855 AUD
A
Retailer 2
-
$4,698 AUD
View
A
Retailer 3
-
$5,349 AUD
View
Retailer 4
-
$5,398 AUD
View
Price last confirmed 23 days ago
Retailer 5
-
$5,606 AUD
View
Price last confirmed 22 days ago
A
Retailer 6
-
$5,670 AUD
View
B+
Retailer 7
-
$6,059 AUD
View
B
Retailer 8
-
$8,792 AUD
View
Most Expensive
NZ Jewellers
0cde3ada-7edd-4044-afbe-0eaec8da3c89 · Oct 14
$9,406 AUD
$6,463 USD
View
Price last confirmed 23 days ago
8 more retailers have this diamond
Prices start from $3,855 AUDSave up to $4,937 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
$3,855 AUD