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Marquise|Natural|GIA

0.65ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 1557173679

Certificate GIA 1557173679

Diamond specifications and retailer prices

From £442 GBP
$595 USD
As of November 6, 2026
1 retailer carries this diamond
Only listing: £442 GBP at The Diamond Guys
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at The Diamond Guys

About this 0.65ct natural marquise diamond

This 0.65ct natural marquise sits in the half to three-quarter 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 1557173679. Listed at a single retailer as of November 6, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

0.65
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle38.77°
Pavilion angle40.22°
OriginNatural
Grading LabGIA
CertificateGIA 1557173679
Dimensions8.67 × 4.55 × 2.84 mm
L/W Ratio1.91
Culet sizeNone
Top View
8.67 mm4.55 mm0.65 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1557173679
Side View
Table 60.0%Crown 38.77°Girdle: STK-THKPavilion 40.22°Culet: NoneDepth 62.5%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: £392 GBP|Low: £236 GBP|High: £846 GBP|Avg: £480 GBP|-20.1%
Retailer 1
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Retailer 5
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Retailer 12
The Diamond Guys
September 10, 2026
Retailer 4£236 GBP
Retailer 9£329 GBP
Retailer 10£353 GBP
Retailer 1£392 GBP
Retailer 6£402 GBP
The Diamond Guys£442 GBP
Retailer 7£461 GBP
Retailer 11£509 GBP
Retailer 5£520 GBP
Retailer 2£522 GBP
Retailer 8£533 GBP
Retailer 3£594 GBP
Retailer 12£689 GBP

44 data points across 13 retailers

1 retailer

B+
The Diamond Guys
1955275112 · Nov 6
£442 GBP
$595 USD
View

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+
0.65ct Marquise
£442 GBP