Marquise|Natural|GIA

1.50ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 6551126708

Certificate GIA 6551126708

Diamond specifications and retailer prices

From $3,993 USD
As of November 6, 2026
Save $3,581 USD (47%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $7,574 USD at With Clarity · As of November 6, 2026
View at With Clarity

About this 1.5ct natural marquise diamond

This 1.5ct natural marquise sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551126708. Listed at 7 retailers as of November 6, 2026, with prices from $3,993 to $7,574, a $3,581 spread on the same certified stone. With Clarity lists it at $7,574. 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

1.50
Carat
K
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6551126708
Dimensions11.71 × 5.89 × 3.57 mm
L/W Ratio1.99
Top View
11.71 mm5.89 mm1.50 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6551126708
Side View
Table 57.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 60.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $4,109 USD|Low: $3,955 USD|High: $7,484 USD|Avg: $5,096 USD|+1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
With Clarity
November 5, 2026
Retailer 2$3,993 USD
Retailer 1$4,109 USD
Retailer 6$4,796 USD
Retailer 4$5,074 USD
Retailer 3$5,252 USD
Retailer 5$5,290 USD
With Clarity$7,484 USD

9 data points across 7 retailers

7 retailers$3,993 USD to $7,574 USD

A
Cheapest Retailer
-
$3,993 USD
A
Retailer 2
-
$4,109 USD
View
B+
Retailer 3
-
$4,796 USD
View
Retailer 4
-
$5,074 USD
View
Price last confirmed 11 days ago
B+
Retailer 5
-
$5,252 USD
View
B+
Retailer 6
-
$5,290 USD
View
Most Expensive
B
With Clarity
6551126708 · Nov 6
$7,574 USD
View
6 more retailers have this diamond
Prices start from $3,993 USDSave up to $3,581 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.

A
1.50ct Marquise
$3,993 USD