Round|Natural|GIA

1.20ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2526662059

Certificate GIA 2526662059

Diamond specifications and retailer prices

From £1,614 GBP
HK$16,900 HKD
As of October 31, 2026
Save £2,031 GBP (56%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,680 GBP at NZ Jewellers · As of September 19, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2526662059. Listed at 21 retailers as of October 29, 2026, with a 126% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2526662059
Dimensions6.78 × 6.74 × 4.24 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.78 mm6.74 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2526662059
Side View
Table 58.0%Crown 35°Girdle: STK-STKPavilion 41.4°Culet: NoneDepth 62.7%

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 31
Current: £4,533 GBP|Low: £1,605 GBP|High: £4,533 GBP|Avg: £2,431 GBP
NZ Jewellers
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
Retailer 15
Retailer 16
Retailer 17
October 31, 2026
Retailer 10£1,614 GBP
Retailer 3£1,852 GBP
Retailer 8£1,941 GBP
Retailer 14£1,970 GBP
Retailer 7£2,000 GBP
Retailer 16£2,001 GBP
Retailer 15£2,120 GBP
Retailer 6£2,168 GBP
Retailer 9£2,247 GBP
Retailer 4£2,274 GBP
Retailer 11£2,304 GBP
Retailer 17£2,429 GBP
Retailer 5£2,502 GBP
Retailer 12£2,538 GBP
Retailer 2£2,665 GBP
Retailer 13£3,645 GBP
NZ Jewellers£4,533 GBP

37 data points across 17 retailers

21 retailers£1,614 GBP to £3,645 GBP

A
Cheapest Retailer
-
£1,614 GBP
HK$16,900 HKD
Retailer 2
-
£1,852 GBP
$2,481 USD
View
Price last confirmed 13 days ago
B+
Retailer 3
-
£1,941 GBP
$2,601 USD
View
B+
Retailer 4
-
£1,970 GBP
$2,640 USD
View
B+
Retailer 5
-
£2,000 GBP
$2,680 USD
View
B+
Retailer 6
-
£2,001 GBP
$2,681 USD
View
Final sale: no returns
B+
Retailer 7
-
£2,120 GBP
$2,840 USD
View
Retailer 8
-
£2,168 GBP
$2,905 USD
View
Price last confirmed 16 days ago
Retailer 9
-
£2,168 GBP
$2,905 USD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
£2,247 GBP
SGD 4,068 SGD
View
Retailer 11
-
£2,252 GBP
$3,017 USD
View
Price last confirmed 16 days ago
B+
Retailer 12
-
£2,274 GBP
$3,047 USD
View
B+
Retailer 13
-
£2,304 GBP
View
Retailer 14
-
£2,429 GBP
A$5,008 AUD
View
Price last confirmed 24 days ago
Retailer 15
-
£2,502 GBP
$3,352 USD
View
Price last confirmed 11 days ago
B
Retailer 16
-
£2,538 GBP
€3,239 EUR
View
Retailer 17
-
£2,583 GBP
$3,461 USD
View
Price last confirmed 39 days ago
B
Retailer 18
-
£2,665 GBP
ZAR 57,691 ZAR
View
B
Retailer 19
-
£3,645 GBP
View
Retailer 20
-
£4,533 GBP
$6,074 USD
View
Price last confirmed 11 days ago
Most Expensive
NZ Jewellers
df505308-ff89-4381-967b-67b853d5eaea · Sep 19
£4,680 GBP
$6,271 USD
View
Price last confirmed 42 days ago
20 more retailers have this diamond
Prices start from £1,614 GBPSave up to £2,031 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
£1,614 GBP