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Round|Natural|GIA

0.99ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 1509368435

Certificate GIA 1509368435

Diamond specifications and retailer prices

From £1,191 GBP
As of November 4, 2026
Save £841 GBP (41%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £2,032 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

About this 0.99ct natural round diamond

This 0.99ct natural round sits in the just-under-one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1509368435. Listed at 5 retailers as of November 4, 2026, with prices from £1,191 to £2,032, a £841 spread on the same certified stone. 77 Diamonds lists it at £2,032. 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

0.99
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1509368435
Dimensions6.38 × 6.36 × 3.98 mm
L/W Ratio1.00
Star length45%
Lower girdle80%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Cloud, Needle, Indented Natural
Top View
6.38 mm6.36 mm0.99 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1509368435
Side View
Table 58.0%Crown 35.5°Girdle: Slightly ThickPavilion 41.4°Culet: NoneDepth 62.5%

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: £2,032 GBP|Low: £1,191 GBP|High: £2,065 GBP|Avg: £1,456 GBP|-0.2%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 5£1,191 GBP
Retailer 3£1,287 GBP
Retailer 2£1,343 GBP
Retailer 4£1,411 GBP
77 Diamonds£2,032 GBP

35 data points across 5 retailers

5 retailers£1,191 GBP to £2,032 GBP

B+
Cheapest Retailer
-
£1,191 GBP
B+
Retailer 2
-
£1,287 GBP
View
B
Retailer 3
-
£1,343 GBP
View
B+
Retailer 4
-
£1,411 GBP
View
Most Expensive
B
77 Diamonds
RBZQYD7KYFK · Nov 6
£2,032 GBP
View
4 more retailers have this diamond
Prices start from £1,191 GBPSave up to £841 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+
0.99ct Round
£1,191 GBP