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Round|Natural|GIA

3.50ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1555525059

Certificate GIA 1555525059

Diamond specifications and retailer prices

From £26,978 GBP
HK$282,400 HKD
As of October 28, 2026
Save £27,413 GBP (50%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £54,391 GBP at With Clarity · As of October 26, 2026
View at With Clarity

About this 3.5ct natural round diamond

This 3.5ct natural round sits in the three to five carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555525059. Listed at 4 retailers as of October 26, 2026, with prices from £26,978 to £54,391, a £27,413 spread on the same certified stone. With Clarity lists it at £54,391. 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

3.50
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1555525059
Dimensions9.59 × 9.66 × 6.05 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Cloud, Needle
Top View
9.59 mm9.66 mm3.50 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555525059
Side View
Table 57.0%Crown 35.5°GirdlePavilion 41°Culet: NoneDepth 62.9%

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 28
Current: £26,978 GBP|Low: £26,978 GBP|High: £54,454 GBP|Avg: £35,362 GBP|-2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
With Clarity
October 26, 2026
Retailer 1£26,978 GBP
Retailer 5£30,386 GBP
Retailer 4£32,537 GBP
Retailer 3£33,330 GBP
Retailer 2£33,798 GBP
With Clarity£54,391 GBP

13 data points across 6 retailers

4 retailers£26,978 GBP to £54,391 GBP

B+
Cheapest Retailer
-
£26,978 GBP
HK$282,400 HKD
B
Retailer 2
-
£33,330 GBP
$44,659 USD
View
Retailer 3
-
£33,798 GBP
SGD 61,196 SGD
View
Price last confirmed 8 days ago
Most Expensive
B
With Clarity
1555525059 · Oct 26
£54,391 GBP
$72,878 USD
View
3 more retailers have this diamond
Prices start from £26,978 GBPSave up to £27,413 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+
3.50ct Round
£26,978 GBP