Marquise|Natural|GIA

1.51ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 6555830427

Certificate GIA 6555830427

Diamond specifications and retailer prices

From $9,165 USD
As of November 4, 2026
Save $8,266 USD (47%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $17,431 USD at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555830427. Listed at 22 retailers as of November 4, 2026, with prices from $9,165 to $17,431, a $8,266 spread on the same certified stone. NZ Jewellers lists it at $17,431. 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
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle39.8°
Pavilion angle39.44°
OriginNatural
Grading LabGIA
CertificateGIA 6555830427
Dimensions11.45 × 5.91 × 3.74 mm
L/W Ratio1.94
Culet sizeNone
Top View
11.45 mm5.91 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6555830427
Side View
Table 58.0%Crown 39.8°Girdle: STK-THKPavilion 39.44°Culet: NoneDepth 63.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $11,190 USD|Low: $9,165 USD|High: $16,530 USD|Avg: $12,478 USD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6$9,165 USD
Retailer 10$10,458 USD
Retailer 1$11,190 USD
Retailer 3$11,330 USD
Retailer 8$11,360 USD
Retailer 2$11,504 USD
Retailer 11$11,665 USD
Retailer 9$12,739 USD
Retailer 7$13,123 USD
Retailer 4$15,258 USD
Retailer 5$16,290 USD

46 data points across 11 retailers

22 retailers$9,165 USD to $17,431 USD

B+
Cheapest Retailer
-
$9,165 USD
B+
Retailer 2
-
$9,703 USD
View
B+
Retailer 3
-
$9,818 USD
View
B
Retailer 4
-
$10,335 USD
View
Retailer 5
-
$10,458 USD
View
Price last confirmed 8 days ago
B
Retailer 6
-
$10,458 USD
View
Final sale: no returns
B
Retailer 7
-
$11,190 USD
View
B
Retailer 8
-
$11,330 USD
View
Retailer 9
-
$11,360 USD
View
Price last confirmed 14 days ago
B
Retailer 10
-
$11,504 USD
View
B
Retailer 11
-
$11,665 USD
View
B
Retailer 12
-
$12,230 USD
View
B
Retailer 13
-
$12,230 USD
View
B
Retailer 14
-
$12,460 USD
View
B
Retailer 15
-
$12,640 USD
View
B
Retailer 16
-
$12,739 USD
View
B
Retailer 17
-
$13,073 USD
View
B
Retailer 18
-
$13,123 USD
View
Retailer 19
-
$13,760 USD
View
Price last confirmed 14 days ago
B
Retailer 20
-
$15,258 USD
View
B
Retailer 21
-
$16,290 USD
View
Most Expensive
B
NZ Jewellers
ae7b53dc-56f9-4716-9037-2b4f7d008ff1 · Nov 5
$17,431 USD
View
21 more retailers have this diamond
Prices start from $9,165 USDSave up to $8,266 USD

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
$9,165 USD