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Marquise|Natural|GIA

1.51ct E SI1 Marquise Natural Diamond

EX • E/SI1 • GIA 1558211257

Certificate GIA 1558211257

Diamond specifications and retailer prices

From $18,216 AUD
$12,796 USD
As of November 1, 2026
Save $11,432 AUD (39%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $29,648 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise 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 stated by the retailer rather than the lab and certified by GIA 1558211257. Listed at 13 retailers as of October 30, 2026, with prices from $18,216 to $29,648, a $11,432 spread on the same certified stone. NZ Jewellers lists it at $29,648. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558211257
Dimensions11.60 × 5.94 × 3.77 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Indented Natural, Knot, Natural
Top View
11.60 mm5.94 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558211257
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.5%

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: $27,781 AUD|Low: $15,009 AUD|High: $28,116 AUD|Avg: $20,461 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
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 1, 2026
Retailer 8$15,009 AUD
Retailer 6$18,208 AUD
Retailer 15$18,216 AUD
Retailer 9$18,654 AUD
Retailer 14$18,816 AUD
Retailer 4$18,987 AUD
Retailer 13$19,093 AUD
Retailer 7$19,271 AUD
Retailer 16$19,283 AUD
Retailer 3$19,636 AUD
Retailer 10$19,903 AUD
Retailer 17$20,944 AUD
Retailer 5$21,549 AUD
Retailer 2$22,090 AUD
Retailer 12$22,413 AUD
Retailer 11$26,134 AUD
Retailer 1$27,781 AUD

39 data points across 17 retailers

13 retailers$18,216 AUD to $29,648 AUD

B+
Cheapest Retailer
-
$18,216 AUD
$12,796 USD
B
Retailer 2
-
$18,816 AUD
$13,217 USD
View
Final sale: no returns
B+
Retailer 3
-
$18,987 AUD
$13,337 USD
View
Retailer 4
-
$19,093 AUD
View
Price last confirmed 9 days ago
B+
Retailer 5
-
$19,283 AUD
$13,545 USD
View
B+
Retailer 6
-
$19,903 AUD
£11,008 GBP
View
B+
Retailer 7
-
$20,944 AUD
$14,712 USD
View
B
Retailer 8
-
$21,271 AUD
$14,942 USD
View
B
Retailer 9
-
$22,090 AUD
$15,517 USD
View
B
Retailer 10
-
$22,413 AUD
€14,994 EUR
View
B
Retailer 11
-
$26,134 AUD
ZAR 296,569 ZAR
View
B
Retailer 12
-
$27,781 AUD
£15,366 GBP
View
Most Expensive
B
NZ Jewellers
c4c34995-0942-4c95-a076-5438e9cfa13b · Oct 30
$29,648 AUD
$20,826 USD
View
12 more retailers have this diamond
Prices start from $18,216 AUDSave up to $11,432 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 Marquise
$18,216 AUD