CaratHunter
Plans
Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1563043428

Certificate GIA 1563043428

Diamond specifications and retailer prices

From £1,617 GBP
$2,166 USD
As of October 25, 2026
Save £1,362 GBP (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £2,979 GBP at Helzberg Diamonds · As of October 25, 2026
View at Helzberg Diamonds

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1563043428. Listed at 14 retailers as of October 25, 2026, with prices from £1,617 to £2,979, a £1,362 spread on the same certified stone. Helzberg Diamonds lists it at £2,979. 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1563043428
Dimensions6.77 × 6.79 × 4.23 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.77 mm6.79 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1563043428
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

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: Oct 25
Current: £2,979 GBP|Low: £1,530 GBP|High: £3,132 GBP|Avg: £2,082 GBP|-3.8%
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
Retailer 14
October 26, 2026
Retailer 13£1,530 GBP
Retailer 11£1,617 GBP
Retailer 9£1,647 GBP
Retailer 12£1,661 GBP
Retailer 8£1,664 GBP
Retailer 7£1,745 GBP
Retailer 5£1,808 GBP
Retailer 14£1,964 GBP
Retailer 4£2,068 GBP
Retailer 10£2,081 GBP
Retailer 2£2,134 GBP
Retailer 6£2,532 GBP
Retailer 3£2,727 GBP
Helzberg Diamonds£2,979 GBP

28 data points across 14 retailers

14 retailers£1,617 GBP to £2,979 GBP

Retailer 1
-
£1,530 GBP
SGD 2,770 SGD
Price last confirmed 7 days ago
A
Retailer 2
-
£1,617 GBP
$2,166 USD
View
A
Retailer 3
-
£1,647 GBP
$2,207 USD
View
Retailer 4
-
£1,661 GBP
$2,226 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
£1,664 GBP
$2,230 USD
View
A
Retailer 6
-
£1,745 GBP
View
A
Retailer 7
-
£1,808 GBP
SGD 3,274 SGD
View
Retailer 8
-
£1,964 GBP
$2,631 USD
View
Price last confirmed 7 days ago
Retailer 9
-
£2,068 GBP
$2,771 USD
View
Price last confirmed 7 days ago
A
Retailer 10
-
£2,081 GBP
View
A
Retailer 11
-
£2,134 GBP
€2,723 EUR
View
B+
Retailer 12
-
£2,532 GBP
$3,393 USD
View
Retailer 13
-
£2,727 GBP
$3,654 USD
View
Price last confirmed 8 days ago
Most Expensive
B+
Helzberg Diamonds
XZRHLMJGKJKIO · Oct 25
£2,979 GBP
$3,991 USD
View
13 more retailers have this diamond
Prices start from £1,617 GBPSave up to £1,362 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
£1,617 GBP