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Round|Natural|GIA

1.20ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 5566280989

Certificate GIA 5566280989

Diamond specifications and retailer prices

From £1,720 GBP
HK$18,000 HKD
As of October 31, 2026
Save £2,114 GBP (55%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,973 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5566280989. Listed at 19 retailers as of October 29, 2026, with a 123% 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5566280989
Dimensions6.76 × 6.73 × 4.27 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Indented Natural, Natural
Top View
6.76 mm6.73 mm1.20 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 5566280989
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 63.3%

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 31
Current: £1,805 GBP|Low: £1,720 GBP|High: £3,860 GBP|Avg: £2,428 GBP|-1.7%
Retailer 1
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 31, 2026
Retailer 7£1,720 GBP
Retailer 1£1,805 GBP
Retailer 12£1,992 GBP
Retailer 13£2,105 GBP
Retailer 8£2,127 GBP
Retailer 5£2,221 GBP
Retailer 2£2,280 GBP
Retailer 4£2,280 GBP
Retailer 10£2,368 GBP
Retailer 3£2,436 GBP
Retailer 9£2,670 GBP
Retailer 6£2,803 GBP
Retailer 11£3,834 GBP

34 data points across 13 retailers

19 retailers£1,720 GBP to £3,834 GBP

A
Cheapest Retailer
-
£1,720 GBP
HK$18,000 HKD
A
Retailer 2
-
£1,805 GBP
₹230,331 INR
View
A
Retailer 3
-
£1,992 GBP
SGD 3,607 SGD
View
A
Retailer 4
-
£2,046 GBP
$2,742 USD
View
A
Retailer 5
-
£2,105 GBP
$2,820 USD
View
Final sale: no returns
A
Retailer 6
-
£2,127 GBP
$2,850 USD
View
A
Retailer 7
-
£2,127 GBP
$2,850 USD
View
Retailer 8
-
£2,221 GBP
View
Price last confirmed 31 days ago
Retailer 9
-
£2,280 GBP
$3,055 USD
View
Price last confirmed 11 days ago
Retailer 10
-
£2,280 GBP
$3,055 USD
View
Price last confirmed 15 days ago
A
Retailer 11
-
£2,368 GBP
View
Retailer 12
-
£2,368 GBP
$3,173 USD
View
Price last confirmed 16 days ago
B+
Retailer 13
-
£2,389 GBP
SGD 4,326 SGD
View
Retailer 14
-
£2,436 GBP
A$5,022 AUD
View
Price last confirmed 23 days ago
Retailer 15
-
£2,631 GBP
$3,525 USD
View
Price last confirmed 12 days ago
B+
Retailer 16
-
£2,670 GBP
€3,407 EUR
View
B+
Retailer 17
-
£2,803 GBP
ZAR 60,669 ZAR
View
B
Retailer 18
-
£3,834 GBP
View
Most Expensive
NZ Jewellers
cc253d74-bfa1-436e-a15f-ccc07b422e88 · Oct 17
£3,973 GBP
$5,323 USD
View
Price last confirmed 14 days ago
18 more retailers have this diamond
Prices start from £1,720 GBPSave up to £2,114 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
£1,720 GBP