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Radiant|Natural|GIA

1.20ct D SI1 Radiant Natural Diamond

VG • D/SI1 • GIA 1555638026

Certificate GIA 1555638026

Diamond specifications and retailer prices

From £2,386 GBP
As of November 4, 2026
Save £2,153 GBP (47%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,539 GBP at Helzberg Diamonds · As of November 4, 2026
View at Helzberg Diamonds

About this 1.2ct natural radiant diamond

This 1.2ct natural radiant sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1555638026. Listed at 13 retailers as of November 4, 2026, with prices from £2,386 to £4,539, a £2,153 spread on the same certified stone. Helzberg Diamonds lists it at £4,539. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.20
Carat
D
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1555638026
Dimensions6.94 × 5.34 × 3.65 mm
L/W Ratio1.30
Culet sizeNone
Top View
6.94 mm5.34 mm1.20 ctD / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555638026
Side View
Table 68.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 68.3%

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: £4,539 GBP|Low: £2,386 GBP|High: £4,539 GBP|Avg: £3,072 GBP|+4.0%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 7, 2026
Retailer 9£2,386 GBP
Retailer 11£2,427 GBP
Retailer 6£2,445 GBP
Retailer 10£2,551 GBP
Retailer 2£2,756 GBP
Retailer 4£2,875 GBP
Retailer 13£3,045 GBP
Retailer 3£3,090 GBP
Retailer 8£3,182 GBP
Retailer 7£3,311 GBP
Retailer 12£4,025 GBP
Retailer 5£4,319 GBP
Helzberg Diamonds£4,539 GBP

38 data points across 13 retailers

13 retailers£2,386 GBP to £4,539 GBP

A
Cheapest Retailer
-
£2,386 GBP
A
Retailer 2
-
£2,427 GBP
View
A
Retailer 3
-
£2,445 GBP
View
B+
Retailer 4
-
£2,551 GBP
View
B+
Retailer 5
-
£2,756 GBP
View
B+
Retailer 6
-
£2,875 GBP
View
B+
Retailer 7
-
£3,045 GBP
View
B+
Retailer 8
-
£3,090 GBP
View
B+
Retailer 9
-
£3,182 GBP
View
B+
Retailer 10
-
£3,311 GBP
View
B
Retailer 11
-
£4,025 GBP
View
B
Retailer 12
-
£4,319 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRHLLLMJOGIM · Nov 4
£4,539 GBP
$6,076 USD
View
12 more retailers have this diamond
Prices start from £2,386 GBPSave up to £2,153 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 Radiant
£2,386 GBP