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Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1529902177

Certificate GIA 1529902177

Diamond specifications and retailer prices

From £1,730 GBP
As of November 6, 2026
Save £2,938 GBP (63%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £4,668 GBP at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1529902177. Listed at 23 retailers as of November 5, 2026, with prices from £1,730 to £4,668, a £2,938 spread on the same certified stone. NZ Jewellers lists it at £4,668. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1529902177
Dimensions6.76 × 6.73 × 4.23 mm
L/W Ratio1.00
Star length55%
Lower girdle75%
Cert comments
Additional clouds are not shown. Pinpoints are not shown.
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
6.76 mm6.73 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1529902177
Side View
Table 56.0%Crown 36.5°Girdle: STK-STKPavilion 40.6°Culet: NoneDepth 62.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £4,668 GBP|Low: £1,721 GBP|High: £4,668 GBP|Avg: £2,534 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
Retailer 18
Retailer 19
Retailer 20
Retailer 21
Retailer 22
November 6, 2026
Retailer 6£1,730 GBP
Retailer 17£1,833 GBP
Retailer 22£1,981 GBP
Retailer 15£1,999 GBP
Retailer 18£2,137 GBP
Retailer 5£2,174 GBP
Retailer 11£2,178 GBP
Retailer 2£2,188 GBP
Retailer 10£2,223 GBP
Retailer 8£2,233 GBP
Retailer 9£2,233 GBP
Retailer 12£2,271 GBP
Retailer 7£2,339 GBP
Retailer 20£2,350 GBP
Retailer 19£2,411 GBP
Retailer 3£2,534 GBP
Retailer 14£2,576 GBP
Retailer 21£2,725 GBP
Retailer 13£3,458 GBP
Retailer 16£3,554 GBP
Retailer 4£3,724 GBP
NZ Jewellers£4,668 GBP

21 data points across 22 retailers

23 retailers£1,730 GBP to £4,668 GBP

A
Cheapest Retailer
-
£1,730 GBP
A
Retailer 2
-
£1,833 GBP
View
A
Retailer 3
-
£1,981 GBP
View
A
Retailer 4
-
£1,999 GBP
View
A
Retailer 5
-
£2,137 GBP
View
A
Retailer 6
-
£2,174 GBP
View
B+
Retailer 7
-
£2,178 GBP
View
B+
Retailer 8
-
£2,188 GBP
View
Final sale: no returns
B+
Retailer 9
-
£2,223 GBP
View
Retailer 10
-
£2,233 GBP
View
Price last confirmed 8 days ago
B+
Retailer 11
-
£2,233 GBP
View
B+
Retailer 12
-
£2,271 GBP
View
B+
Retailer 13
-
£2,339 GBP
View
B+
Retailer 14
-
£2,350 GBP
View
B+
Retailer 15
-
£2,411 GBP
View
Retailer 16
-
£2,492 GBP
View
Price last confirmed 33 days ago
B+
Retailer 17
-
£2,534 GBP
View
B+
Retailer 18
-
£2,576 GBP
View
B+
Retailer 19
-
£2,725 GBP
View
B
Retailer 20
-
£3,458 GBP
View
B
Retailer 21
-
£3,554 GBP
View
B
Retailer 22
-
£3,724 GBP
View
Most Expensive
B
NZ Jewellers
70207aa8-05a6-449f-be79-1473d28e1b34 · Nov 5
£4,668 GBP
$6,248 USD
View
22 more retailers have this diamond
Prices start from £1,730 GBPSave up to £2,938 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
£1,730 GBP