Round|Natural|GIA

1.50ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6435526632

Certificate GIA 6435526632

Diamond specifications and retailer prices

From £2,318 GBP
As of November 4, 2026
Save £2,727 GBP (54%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £5,766 GBP at NZ Jewellers · As of September 25, 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 6435526632. Listed at 16 retailers as of November 1, 2026, with a 118% 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

1.50
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6435526632
Dimensions7.33 × 7.29 × 4.56 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
7.33 mm7.29 mm1.50 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6435526632
Side View
Table 57.0%Crown 36°Girdle: MediumPavilion 41°Culet: NoneDepth 62.4%

Caratlytics Score

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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 4
Current: £3,037 GBP|Low: £2,318 GBP|High: £5,327 GBP|Avg: £3,018 GBP|-7.5%
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
November 6, 2026
Retailer 12£2,318 GBP
Retailer 8£2,348 GBP
Retailer 4£2,357 GBP
Retailer 13£2,426 GBP
Retailer 2£2,537 GBP
Retailer 3£2,567 GBP
Retailer 10£2,623 GBP
Retailer 11£2,733 GBP
Retailer 1£3,037 GBP
Retailer 7£3,299 GBP
Retailer 5£3,415 GBP
Retailer 6£3,682 GBP
Retailer 9£5,045 GBP

43 data points across 13 retailers

16 retailers£2,318 GBP to £5,045 GBP

A
Cheapest Retailer
-
£2,318 GBP
A
Retailer 2
-
£2,348 GBP
View
A
Retailer 3
-
£2,357 GBP
View
A
Retailer 4
-
£2,426 GBP
View
A
Retailer 5
-
£2,537 GBP
View
A
Retailer 6
-
£2,567 GBP
View
A
Retailer 7
-
£2,623 GBP
View
Retailer 8
-
£2,733 GBP
View
Price last confirmed 13 days ago
Retailer 9
-
£2,998 GBP
View
Price last confirmed 45 days ago
B+
Retailer 10
-
£3,037 GBP
View
B+
Retailer 11
-
£3,299 GBP
View
Retailer 12
-
£3,415 GBP
View
Price last confirmed 14 days ago
Retailer 13
-
£3,459 GBP
View
Price last confirmed 45 days ago
B+
Retailer 14
-
£3,682 GBP
View
B
Retailer 15
-
£5,045 GBP
View
Most Expensive
NZ Jewellers
2bf72783-4f62-4dcf-9291-b59d4f1f36b8 · Sep 25
£5,766 GBP
$7,760 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from £2,318 GBPSave up to £2,727 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
£2,318 GBP