Round|Natural|GIA

1.20ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6521501206

Certificate GIA 6521501206

Diamond specifications and retailer prices

From £4,268 GBP
$5,719 USD
As of October 30, 2026
Save £2,806 GBP (40%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £8,186 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6521501206. Listed at 18 retailers as of October 29, 2026, with a 66% 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6521501206
Dimensions6.76 × 6.80 × 4.26 mm
L/W Ratio1.01
Star length45%
Lower girdle75%
Top View
6.76 mm6.80 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6521501206
Side View
Table 56.0%Crown 35°Girdle: THN-STKPavilion 41.4°CuletDepth 62.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £6,013 GBP|Low: £4,268 GBP|High: £7,122 GBP|Avg: £5,087 GBP|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 7£4,268 GBP
Retailer 2£4,314 GBP
Retailer 10£4,518 GBP
Retailer 9£4,545 GBP
Retailer 4£4,610 GBP
Retailer 5£4,663 GBP
Retailer 8£4,775 GBP
Retailer 3£5,348 GBP
Retailer 1£6,013 GBP
Retailer 6£7,075 GBP

42 data points across 10 retailers

18 retailers£4,268 GBP to £7,075 GBP

B+
Cheapest Retailer
-
£4,268 GBP
$5,719 USD
B+
Retailer 2
-
£4,314 GBP
$5,780 USD
View
Retailer 3
-
£4,518 GBP
$6,053 USD
View
Price last confirmed 15 days ago
B
Retailer 4
-
£4,545 GBP
$6,090 USD
View
B+
Retailer 5
-
£4,610 GBP
View
B+
Retailer 6
-
£4,663 GBP
View
Retailer 7
-
£4,775 GBP
A$9,842 AUD
View
Price last confirmed 21 days ago
Retailer 8
-
£4,894 GBP
$6,557 USD
View
Price last confirmed 39 days ago
Retailer 9
-
£4,894 GBP
$6,557 USD
View
Price last confirmed 13 days ago
Retailer 10
-
£4,969 GBP
$6,658 USD
View
Price last confirmed 16 days ago
B
Retailer 11
-
£5,012 GBP
$6,716 USD
View
B
Retailer 12
-
£5,348 GBP
€6,825 EUR
View
Retailer 13
-
£5,647 GBP
$7,566 USD
View
Price last confirmed 39 days ago
Retailer 14
-
£5,647 GBP
$7,566 USD
View
Price last confirmed 13 days ago
B
Retailer 15
-
£6,013 GBP
ZAR 130,158 ZAR
View
B
Retailer 16
-
£7,075 GBP
View
Retailer 17
-
£8,186 GBP
$10,968 USD
View
Price last confirmed 36 days ago
Most Expensive
NZ Jewellers
ff94d009-ce99-4fd1-aa99-fb89a8136b35 · Oct 17
£8,186 GBP
$10,968 USD
View
Price last confirmed 14 days ago
17 more retailers have this diamond
Prices start from £4,268 GBPSave up to £2,806 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.

B+
1.20ct Round
£4,268 GBP