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Round|Natural|GIA

5.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2135168818

Certificate GIA 2135168818

Diamond specifications and retailer prices

From $56,641 USD
As of November 6, 2026
Save $35,198 USD (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $91,839 USD at MOH London · As of November 4, 2026
View at MOH London

About this 5.21ct natural round diamond

This 5.21ct 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 2135168818. Listed at 9 retailers as of November 4, 2026, with prices from $56,641 to $91,839, a $35,198 spread on the same certified stone. MOH London lists it at $91,839. 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

5.21
Carat
K
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2135168818
Dimensions11.05 × 11.08 × 6.86 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Top View
11.05 mm11.08 mm5.21 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2135168818
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.0%

Caratlytics Score

How it works →
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: $91,839 USD|Low: $56,641 USD|High: $93,195 USD|Avg: $66,333 USD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8$56,641 USD
Retailer 4$57,768 USD
Retailer 2$59,024 USD
Retailer 5$62,583 USD
Retailer 6$62,583 USD
Retailer 7$66,193 USD
Retailer 3$69,411 USD
MOH London$91,839 USD

36 data points across 8 retailers

9 retailers$56,641 USD to $91,839 USD

A
Cheapest Retailer
-
$56,641 USD
A
Retailer 2
-
$57,768 USD
View
A
Retailer 3
-
$59,024 USD
View
Retailer 4
-
$61,419 USD
View
Price last confirmed 48 days ago
B+
Retailer 5
-
$62,583 USD
View
B+
Retailer 6
-
$62,583 USD
View
B+
Retailer 7
-
$66,193 USD
View
B+
Retailer 8
-
$69,411 USD
View
Most Expensive
B
MOH London
AAE49B0FC · Nov 4
$91,839 USD
£72,314 GBP
View
8 more retailers have this diamond
Prices start from $56,641 USDSave up to $35,198 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
5.21ct Round
$56,641 USD