Radiant|Natural|GIA

1.20ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 2566030662

Certificate GIA 2566030662

Diamond specifications and retailer prices

From £1,278 GBP
$1,713 USD
As of October 25, 2026
Save £987 GBP (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,266 GBP at Helzberg Diamonds · As of October 25, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2566030662. Listed at 13 retailers as of October 25, 2026, with prices from £1,278 to £2,266, a £987 spread on the same certified stone. Helzberg Diamonds lists it at £2,266. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2566030662
Dimensions7.24 × 5.34 × 3.62 mm
L/W Ratio1.36
Culet sizeNone
Top View
7.24 mm5.34 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2566030662
Side View
Table 66.0%CrownGirdle: ThickPavilionCulet: NoneDepth 67.7%

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: Oct 25
Current: £2,266 GBP|Low: £1,236 GBP|High: £2,479 GBP|Avg: £1,687 GBP|-8.6%
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
October 26, 2026
Retailer 9£1,236 GBP
Retailer 10£1,263 GBP
Retailer 7£1,264 GBP
Retailer 8£1,278 GBP
Retailer 2£1,349 GBP
Retailer 4£1,375 GBP
Retailer 13£1,440 GBP
Retailer 11£1,516 GBP
Retailer 3£1,653 GBP
Retailer 6£1,775 GBP
Retailer 5£1,926 GBP
Retailer 12£2,106 GBP
Helzberg Diamonds£2,266 GBP

32 data points across 13 retailers

13 retailers£1,278 GBP to £2,266 GBP

Retailer 1
-
£1,236 GBP
SGD 2,238 SGD
Price last confirmed 8 days ago
Retailer 2
-
£1,263 GBP
$1,693 USD
View
Price last confirmed 8 days ago
Retailer 3
-
£1,264 GBP
$1,693 USD
View
Price last confirmed 8 days ago
A
Retailer 4
-
£1,278 GBP
$1,713 USD
View
A
Retailer 5
-
£1,349 GBP
View
A
Retailer 6
-
£1,375 GBP
SGD 2,490 SGD
View
A
Retailer 7
-
£1,440 GBP
$1,930 USD
View
Retailer 8
-
£1,516 GBP
$2,031 USD
View
Price last confirmed 9 days ago
Retailer 9
-
£1,653 GBP
$2,215 USD
View
Price last confirmed 9 days ago
A
Retailer 10
-
£1,775 GBP
€2,265 EUR
View
Retailer 11
-
£1,926 GBP
$2,580 USD
View
Price last confirmed 8 days ago
Retailer 12
-
£2,106 GBP
$2,822 USD
View
Price last confirmed 9 days ago
Most Expensive
B+
Helzberg Diamonds
XZRILMMGJGMMI · Oct 25
£2,266 GBP
$3,036 USD
View
12 more retailers have this diamond
Prices start from £1,278 GBPSave up to £987 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
£1,278 GBP