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Round|Natural|GIA

1.50ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 3425008603

Certificate GIA 3425008603

Diamond specifications and retailer prices

From £2,929 GBP
As of November 6, 2026
Save £3,727 GBP (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £6,656 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.5ct natural round diamond

This 1.5ct natural round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3425008603. Listed at 16 retailers as of November 5, 2026, with prices from £2,929 to £6,656, a £3,727 spread on the same certified stone. NZ Jewellers lists it at £6,656. 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

1.50
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 3425008603
Dimensions7.29 × 7.26 × 4.54 mm
L/W Ratio1.00
Top View
7.29 mm7.26 mm1.50 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3425008603
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.4%

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: Nov 6
Current: £6,656 GBP|Low: £2,910 GBP|High: £6,656 GBP|Avg: £4,196 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
November 6, 2026
Retailer 13£2,929 GBP
Retailer 3£2,996 GBP
Retailer 11£3,061 GBP
Retailer 5£3,355 GBP
Retailer 14£3,358 GBP
Retailer 4£3,605 GBP
Retailer 15£3,605 GBP
Retailer 6£3,798 GBP
Retailer 9£3,819 GBP
Retailer 12£4,098 GBP
Retailer 7£4,160 GBP
Retailer 2£4,333 GBP
Retailer 8£4,855 GBP
Retailer 10£6,321 GBP
NZ Jewellers£6,656 GBP

38 data points across 15 retailers

16 retailers£2,929 GBP to £6,656 GBP

B+
Cheapest Retailer
-
£2,929 GBP
B+
Retailer 2
-
£2,996 GBP
View
A
Retailer 3
-
£3,061 GBP
View
B+
Retailer 4
-
£3,355 GBP
View
B+
Retailer 5
-
£3,358 GBP
View
B+
Retailer 6
-
£3,605 GBP
View
B+
Retailer 7
-
£3,605 GBP
View
B
Retailer 8
-
£3,798 GBP
View
B+
Retailer 9
-
£3,819 GBP
View
B+
Retailer 10
-
£4,098 GBP
View
B
Retailer 11
-
£4,160 GBP
View
B+
Retailer 12
-
£4,333 GBP
View
Retailer 13
-
£4,456 GBP
View
Price last confirmed 14 days ago
B
Retailer 14
-
£4,855 GBP
View
B
Retailer 15
-
£6,321 GBP
View
Most Expensive
B
NZ Jewellers
d005f766-8512-42a3-90e3-1ed707413889 · Nov 5
£6,656 GBP
$8,958 USD
View
15 more retailers have this diamond
Prices start from £2,929 GBPSave up to £3,727 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
1.50ct Round
£2,929 GBP