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Round|Natural|GIA

1.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2125868320

Certificate GIA 2125868320

Diamond specifications and retailer prices

From $12,652 AUD
$8,887 USD
As of October 30, 2026
Save $11,704 AUD (48%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $24,355 AUD at Diamond Quarter · As of October 31, 2026
View at Diamond Quarter

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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2125868320. Listed at 19 retailers as of October 30, 2026, with prices from $12,652 to $24,355, a $11,704 spread on the same certified stone. Diamond Quarter lists it at $24,355. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2125868320
Dimensions7.37 × 7.35 × 4.56 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.37 mm7.35 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2125868320
Side View
Table 57.0%CrownGirdle: MediumPavilionCulet: NoneDepth 62.0%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $21,721 AUD|Low: $11,590 AUD|High: $23,179 AUD|Avg: $16,721 AUD|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 6$12,378 AUD
Retailer 7$13,907 AUD
Retailer 10$13,907 AUD
Retailer 11$15,067 AUD
Retailer 4$15,122 AUD
Retailer 8$15,298 AUD
Retailer 5$16,658 AUD
Retailer 9$17,385 AUD
Retailer 3$18,302 AUD
Retailer 1$21,721 AUD
Retailer 2$23,179 AUD

40 data points across 11 retailers

19 retailers$12,652 AUD to $24,355 AUD

Retailer 1
-
$12,378 AUD
$8,695 USD
Price last confirmed 7 days ago
B
Retailer 2
-
$12,652 AUD
$8,887 USD
View
B
Retailer 3
-
$12,904 AUD
$9,064 USD
View
B
Retailer 4
-
$13,386 AUD
CA$13,059 CAD
View
B
Retailer 5
-
$13,907 AUD
$9,769 USD
View
B
Retailer 6
-
$13,907 AUD
$9,769 USD
View
Final sale: no returns
B
Retailer 7
-
$15,067 AUD
$10,584 USD
View
B
Retailer 8
-
$15,122 AUD
£8,364 GBP
View
B
Retailer 9
-
$15,298 AUD
$10,746 USD
View
B
Retailer 10
-
$16,047 AUD
$11,272 USD
View
B
Retailer 11
-
$16,314 AUD
$11,460 USD
View
B
Retailer 12
-
$16,314 AUD
$11,460 USD
View
B
Retailer 13
-
$16,658 AUD
€11,144 EUR
View
B
Retailer 14
-
$16,870 AUD
$11,850 USD
View
B
Retailer 15
-
$17,385 AUD
$12,212 USD
View
Retailer 16
-
$18,302 AUD
$12,856 USD
View
Price last confirmed 9 days ago
B
Retailer 17
-
$21,721 AUD
£12,014 GBP
View
B
Retailer 18
-
$23,179 AUD
$16,282 USD
View
Most Expensive
B
Diamond Quarter
1.51SI2H2120A7B6N · Oct 31
$24,355 AUD
£13,471 GBP
View
18 more retailers have this diamond
Prices start from $12,652 AUDSave up to $11,704 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
$12,652 AUD