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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1155978214

Certificate GIA 1155978214

Diamond specifications and retailer prices

From $15,736 AUD
$11,055 USD
As of October 25, 2026
Save $14,568 AUD (48%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $30,303 AUD at Diamond Quarter · As of October 29, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1155978214. Listed at 18 retailers as of October 25, 2026, with prices from $15,736 to $30,303, a $14,568 spread on the same certified stone. Diamond Quarter lists it at $30,303. 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
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 1155978214
Dimensions7.38 × 7.36 × 4.47 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.38 mm7.36 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1155978214
Side View
Table 60.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.6%

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: Oct 25
Current: $21,643 AUD|Low: $14,889 AUD|High: $28,238 AUD|Avg: $21,116 AUD|+4.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 29, 2026
Retailer 6$15,736 AUD
Retailer 7$17,122 AUD
Retailer 2$18,927 AUD
Retailer 5$19,177 AUD
Retailer 1$21,643 AUD
Retailer 4$26,108 AUD
Retailer 3$28,052 AUD

43 data points across 7 retailers

18 retailers$15,736 AUD to $30,303 AUD

B+
Cheapest Retailer
-
$15,736 AUD
$11,055 USD
B+
Retailer 2
-
$16,311 AUD
$11,459 USD
View
B+
Retailer 3
-
$16,577 AUD
$11,646 USD
View
B+
Retailer 4
-
$16,692 AUD
CA$16,288 CAD
View
B
Retailer 5
-
$17,122 AUD
$12,029 USD
View
Final sale: no returns
B
Retailer 6
-
$17,579 AUD
$12,350 USD
View
B
Retailer 7
-
$17,867 AUD
$12,552 USD
View
B
Retailer 8
-
$18,927 AUD
£10,470 GBP
View
B
Retailer 9
-
$19,056 AUD
$13,388 USD
View
B
Retailer 10
-
$19,177 AUD
View
B
Retailer 11
-
$19,354 AUD
$13,597 USD
View
B
Retailer 12
-
$20,098 AUD
$14,120 USD
View
B
Retailer 13
-
$20,701 AUD
$14,543 USD
View
B
Retailer 14
-
$21,643 AUD
€14,481 EUR
View
B
Retailer 15
-
$26,108 AUD
ZAR 296,315 ZAR
View
B
Retailer 16
-
$28,052 AUD
£15,518 GBP
View
B
Retailer 17
-
$29,776 AUD
$20,919 USD
View
Most Expensive
B
Diamond Quarter
1.51SI1E1114893CN · Oct 29
$30,303 AUD
£16,763 GBP
View
17 more retailers have this diamond
Prices start from $15,736 AUDSave up to $14,568 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
$15,736 AUD