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Round|Natural|GIA

2.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1558302144

Certificate GIA 1558302144

Diamond specifications and retailer prices

From $30,243 AUD
$21,195 USD
As of November 1, 2026
Save $13,674 AUD (31%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $43,917 AUD at Diamonds Direct · As of November 1, 2026
View at Diamonds Direct

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1558302144. Listed at 13 retailers as of November 1, 2026, with prices from $30,243 to $43,917, a $13,674 spread on the same certified stone. Diamonds Direct lists it at $43,917. 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

2.51
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1558302144
Dimensions8.60 × 8.64 × 5.41 mm
L/W Ratio1.00
Culet sizeNone
Top View
8.60 mm8.64 mm2.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558302144
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: $43,917 AUD|Low: $29,248 AUD|High: $54,603 AUD|Avg: $36,567 AUD|-4.2%
Diamonds Direct
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
November 2, 2026
Retailer 9$30,243 AUD
Retailer 10$31,326 AUD
Retailer 15$31,459 AUD
Retailer 4$32,108 AUD
Retailer 5$33,107 AUD
Retailer 8$33,372 AUD
Retailer 11$34,337 AUD
Retailer 13$36,212 AUD
Retailer 16$36,686 AUD
Retailer 12$36,746 AUD
Retailer 6$37,206 AUD
Retailer 14$37,342 AUD
Retailer 2$38,583 AUD
Retailer 3$41,357 AUD
Diamonds Direct$43,917 AUD
Retailer 7$53,510 AUD

38 data points across 16 retailers

13 retailers$30,243 AUD to $43,917 AUD

B+
Cheapest Retailer
-
$30,243 AUD
$21,195 USD
B+
Retailer 2
-
$31,326 AUD
$21,954 USD
View
B+
Retailer 3
-
$31,459 AUD
SGD 29,793 SGD
View
Retailer 4
-
$33,372 AUD
$23,388 USD
View
Price last confirmed 28 days ago
B
Retailer 5
-
$34,337 AUD
$24,064 USD
View
B
Retailer 6
-
$36,212 AUD
$25,378 USD
View
B
Retailer 7
-
$36,686 AUD
$25,710 USD
View
B
Retailer 8
-
$36,746 AUD
$25,752 USD
View
B+
Retailer 9
-
$37,342 AUD
$26,170 USD
View
B
Retailer 10
-
$38,583 AUD
$27,040 USD
View
B
Retailer 11
-
$39,702 AUD
$27,824 USD
View
B
Retailer 12
-
$41,357 AUD
$28,984 USD
View
Most Expensive
B
Diamonds Direct
1136884 · Nov 1
$43,917 AUD
$30,778 USD
View
12 more retailers have this diamond
Prices start from $30,243 AUDSave up to $13,674 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+
2.51ct Round
$30,243 AUD