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Round|Natural|GIA

1.09ct K VS1 Round Natural Diamond

EX • K/VS1 • GIA 6421853820

Certificate GIA 6421853820

Diamond specifications and retailer prices

From £1,585 GBP
As of November 4, 2026
Save £855 GBP (35%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £2,440 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

About this 1.09ct natural round diamond

This 1.09ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by GIA 6421853820. Listed at 5 retailers as of November 4, 2026, with prices from £1,585 to £2,440, a £855 spread on the same certified stone. 77 Diamonds lists it at £2,440. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.09
Carat
K
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6421853820
Dimensions6.54 × 6.49 × 4.08 mm
L/W Ratio1.01
Star length55%
Lower girdle75%
Top View
6.54 mm6.49 mm1.09 ctK / VS1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 6421853820
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £2,440 GBP|Low: £1,525 GBP|High: £2,477 GBP|Avg: £1,936 GBP|+4.2%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 4£1,585 GBP
Retailer 3£1,642 GBP
Retailer 5£1,751 GBP
Retailer 2£2,392 GBP
77 Diamonds£2,440 GBP

42 data points across 5 retailers

5 retailers£1,585 GBP to £2,440 GBP

A
Cheapest Retailer
-
£1,585 GBP
A
Retailer 2
-
£1,642 GBP
View
B+
Retailer 3
-
£1,751 GBP
View
B
Retailer 4
-
£2,392 GBP
View
Most Expensive
B
77 Diamonds
RBZAK82VKEA · Nov 6
£2,440 GBP
View
4 more retailers have this diamond
Prices start from £1,585 GBPSave up to £855 GBP

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
1.09ct Round
£1,585 GBP