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6.37ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5211215221

Certificate GIA 5211215221

Diamond specifications and retailer prices

From £59,508 GBP
$80,092 USD
As of November 5, 2026
1 retailer carries this diamond
Only listing: £59,508 GBP at Blue Nile
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 Blue Nile

About this 6.37ct natural round diamond

This 6.37ct natural round sits in the over five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5211215221. Listed at a single retailer as of November 5, 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

6.37
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
OriginNatural
Grading LabGIA
CertificateGIA 5211215221
Dimensions11.76 × 11.80 × 7.36 mm
L/W Ratio1.00
Top View
11.76 mm11.80 mm6.37 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5211215221
Side View
Table 57.0%Crown 35.5°Girdle: MediumPavilionCulet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: £59,508 GBP|Low: £52,330 GBP|High: £76,362 GBP|Avg: £62,257 GBP
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
September 26, 2026
Retailer 2£52,330 GBP
Retailer 3£54,905 GBP
Retailer 7£59,224 GBP
Blue Nile£59,508 GBP
Retailer 6£60,696 GBP
Retailer 4£71,398 GBP
Retailer 5£76,362 GBP

2 data points across 7 retailers

1 retailer

B+
Blue Nile
27306622 · Nov 5
£59,508 GBP
$80,092 USD
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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+
6.37ct Round
£59,508 GBP