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Round|Natural|GIA

3.18ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6551717443

Certificate GIA 6551717443

Diamond specifications and retailer prices

From £29,909 GBP
As of November 4, 2026
Save £21,495 GBP (42%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: £51,404 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 3.18ct natural round diamond

This 3.18ct natural round sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551717443. Listed at 24 retailers as of November 4, 2026, with prices from £29,909 to £51,404, a £21,495 spread on the same certified stone. MOH London lists it at £51,404. 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

3.18
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6551717443
Dimensions9.35 × 9.29 × 5.77 mm
L/W Ratio1.01
Key to symbols
Crystal, Feather, Needle
Top View
9.35 mm9.29 mm3.18 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551717443
Side View
Table 59.0%Crown 35°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 61.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £51,404 GBP|Low: £29,501 GBP|High: £69,722 GBP|Avg: £41,369 GBP|-26.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
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Retailer 11
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Retailer 22
November 6, 2026
Retailer 20£29,501 GBP
Retailer 3£29,909 GBP
Retailer 6£30,252 GBP
Retailer 4£31,986 GBP
Retailer 16£32,689 GBP
Retailer 10£33,003 GBP
Retailer 7£33,027 GBP
Retailer 9£34,326 GBP
Retailer 18£34,326 GBP
Retailer 5£34,378 GBP
Retailer 11£34,378 GBP
Retailer 15£35,297 GBP
Retailer 8£35,315 GBP
Retailer 22£35,470 GBP
Retailer 21£35,753 GBP
Retailer 19£37,128 GBP
Retailer 17£39,908 GBP
Retailer 12£42,036 GBP
Retailer 13£42,488 GBP
Retailer 2£44,539 GBP
Retailer 14£45,272 GBP
MOH London£51,404 GBP

25 data points across 22 retailers

24 retailers£29,909 GBP to £51,404 GBP

Retailer 1
-
£29,501 GBP
Price last confirmed 8 days ago
A
Retailer 2
-
£29,909 GBP
View
A
Retailer 3
-
£30,252 GBP
View
Final sale: no returns
A
Retailer 4
-
£31,986 GBP
View
A
Retailer 5
-
£32,689 GBP
View
Retailer 6
-
£33,003 GBP
View
Price last confirmed 12 days ago
B+
Retailer 7
-
£33,027 GBP
View
B+
Retailer 8
-
£34,326 GBP
View
B+
Retailer 9
-
£34,326 GBP
View
B+
Retailer 10
-
£34,378 GBP
View
B+
Retailer 11
-
£34,378 GBP
View
B+
Retailer 12
-
£35,297 GBP
View
B+
Retailer 13
-
£35,315 GBP
View
B+
Retailer 14
-
£35,470 GBP
View
B+
Retailer 15
-
£35,753 GBP
View
B+
Retailer 16
-
£37,128 GBP
View
B+
Retailer 17
-
£39,908 GBP
View
Retailer 18
-
£42,036 GBP
View
Price last confirmed 37 days ago
B
Retailer 19
-
£42,488 GBP
View
B+
Retailer 20
-
£44,539 GBP
View
Retailer 21
-
£46,503 GBP
View
Price last confirmed 48 days ago
Retailer 22
-
£48,363 GBP
View
Price last confirmed 45 days ago
Retailer 23
-
£50,223 GBP
View
Price last confirmed 45 days ago
Most Expensive
B
MOH London
0BC3ED65C · Nov 4
£51,404 GBP
View
23 more retailers have this diamond
Prices start from £29,909 GBPSave up to £21,495 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
3.18ct Round
£29,909 GBP