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Round|Natural|GIA

1.18ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 1525556641

Certificate GIA 1525556641

Diamond specifications and retailer prices

From £4,231 GBP
As of October 31, 2026
Save £2,174 GBP (34%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £6,405 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.18ct natural round diamond

This 1.18ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1525556641. Listed at 3 retailers as of October 29, 2026, with prices from £4,231 to £6,405, a £2,174 spread on the same certified stone. MOH London lists it at £6,405. 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

1.18
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1525556641
Dimensions6.78 × 6.81 × 4.18 mm
L/W Ratio1.00
Top View
6.78 mm6.81 mm1.18 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1525556641
Side View
Table 58.0%CrownGirdle: MediumPavilionCulet: NoneDepth 61.6%

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 31
Current: £6,405 GBP|Low: £3,209 GBP|High: £6,447 GBP|Avg: £4,111 GBP|-0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6£3,209 GBP
Retailer 4£3,353 GBP
Retailer 5£3,544 GBP
Retailer 7£3,709 GBP
Retailer 9£3,817 GBP
Retailer 8£4,024 GBP
Retailer 2£4,231 GBP
Retailer 3£4,560 GBP
Retailer 10£4,941 GBP
MOH London£6,405 GBP

30 data points across 10 retailers

3 retailers£4,231 GBP to £6,405 GBP

B+
Cheapest Retailer
-
£4,231 GBP
B
Retailer 2
-
£4,560 GBP
€5,819 EUR
View
Most Expensive
B
MOH London
4E8487882 · Oct 29
£6,405 GBP
View
2 more retailers have this diamond
Prices start from £4,231 GBPSave up to £2,174 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+
1.18ct Round
£4,231 GBP