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Round|Natural|GIA

1.20ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 6551379543

Certificate GIA 6551379543

Diamond specifications and retailer prices

From £1,950 GBP
As of November 6, 2026
Save £2,360 GBP (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,694 GBP at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551379543. Listed at 21 retailers as of November 4, 2026, with a 121% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.20
Carat
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6551379543
Dimensions6.72 × 6.76 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Indented Natural, Natural
Top View
6.72 mm6.76 mm1.20 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551379543
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.8%

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 6
Current: £4,694 GBP|Low: £1,950 GBP|High: £4,713 GBP|Avg: £2,985 GBP|+2.7%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 9£1,950 GBP
Retailer 6£2,031 GBP
Retailer 7£2,273 GBP
Retailer 2£2,473 GBP
Retailer 4£2,658 GBP
Retailer 3£2,710 GBP
Retailer 5£3,002 GBP
Retailer 8£4,310 GBP
Queensmith£4,694 GBP

27 data points across 9 retailers

21 retailers£1,950 GBP to £4,310 GBP

A
Cheapest Retailer
-
£1,950 GBP
A
Retailer 2
-
£2,031 GBP
View
A
Retailer 3
-
£2,273 GBP
View
A
Retailer 4
-
£2,385 GBP
View
Final sale: no returns
A
Retailer 5
-
£2,392 GBP
View
A
Retailer 6
-
£2,473 GBP
View
Retailer 7
-
£2,585 GBP
View
Price last confirmed 43 days ago
Retailer 8
-
£2,585 GBP
View
Price last confirmed 21 days ago
Retailer 9
-
£2,585 GBP
View
Price last confirmed 17 days ago
A
Retailer 10
-
£2,658 GBP
View
Retailer 11
-
£2,684 GBP
View
Price last confirmed 22 days ago
B+
Retailer 12
-
£2,692 GBP
View
B+
Retailer 13
-
£2,710 GBP
View
Retailer 14
-
£2,982 GBP
View
Price last confirmed 70 days ago
Retailer 15
-
£2,982 GBP
View
Price last confirmed 19 days ago
Retailer 16
-
£2,982 GBP
View
Price last confirmed 45 days ago
B+
Retailer 17
-
£3,002 GBP
View
B
Retailer 18
-
£4,310 GBP
View
Retailer 19
-
£4,503 GBP
View
Price last confirmed 20 days ago
Retailer 20
-
£4,503 GBP
View
Price last confirmed 42 days ago
Most Expensive
Queensmith
6551379543 · Oct 28
£4,694 GBP
View
Price last confirmed 8 days ago
20 more retailers have this diamond
Prices start from £1,950 GBPSave up to £2,360 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
1.20ct Round
£1,950 GBP