CaratHunter
Plans
Round|Natural|GIA

1.55ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 1539355495

Certificate GIA 1539355495

Diamond specifications and retailer prices

From £3,554 GBP
As of November 4, 2026
Save £1,891 GBP (35%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £5,446 GBP at Cape Diamonds · As of November 5, 2026
View at Cape Diamonds

About this 1.55ct natural round diamond

This 1.55ct natural round sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1539355495. Listed at 12 retailers as of November 4, 2026, with prices from £3,554 to £5,446, a £1,891 spread on the same certified stone. Cape Diamonds lists it at £5,446. 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

1.55
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1539355495
Dimensions7.41 × 7.36 × 4.58 mm
L/W Ratio1.01
Cert comments
Additional clouds, pinpoints and surface graining are not shown.
Key to symbols
Crystal, Cloud, Feather
Top View
7.41 mm7.36 mm1.55 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1539355495
Side View
Table 58.0%Crown 35°Girdle: MED-THKPavilion 40.8°Culet: NoneDepth 62.0%

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: Nov 4
Current: £5,446 GBP|Low: £3,554 GBP|High: £5,644 GBP|Avg: £4,439 GBP|-3.3%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 3£3,554 GBP
Retailer 6£3,786 GBP
Retailer 5£4,237 GBP
Retailer 10£4,280 GBP
Retailer 7£4,282 GBP
Retailer 8£4,517 GBP
Retailer 9£4,517 GBP
Retailer 4£4,557 GBP
Retailer 2£4,575 GBP
Retailer 11£4,666 GBP
Cape Diamonds£5,446 GBP

44 data points across 11 retailers

12 retailers£3,554 GBP to £5,446 GBP

Retailer 1
-
£3,261 GBP
Price last confirmed 68 days ago
B+
Retailer 2
-
£3,554 GBP
View
B+
Retailer 3
-
£3,786 GBP
View
B+
Retailer 4
-
£4,237 GBP
View
B+
Retailer 5
-
£4,280 GBP
View
B+
Retailer 6
-
£4,282 GBP
View
B
Retailer 7
-
£4,517 GBP
View
B
Retailer 8
-
£4,517 GBP
View
B
Retailer 9
-
£4,557 GBP
View
B
Retailer 10
-
£4,575 GBP
View
B
Retailer 11
-
£4,666 GBP
View
Most Expensive
B
Cape Diamonds
cert_1539355495 · Nov 5
£5,446 GBP
ZAR 118,408 ZAR
View
11 more retailers have this diamond
Prices start from £3,554 GBPSave up to £1,891 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+
1.55ct Round
£3,554 GBP