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Oval|Natural|GIA

0.51ct G SI1 Oval Natural Diamond

GD • G/SI1 • GIA 1518186849

Certificate GIA 1518186849

Diamond specifications and retailer prices

From £640 GBP
$858 USD
As of November 2, 2026
Save £632 GBP (50%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,272 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 0.51ct natural oval diamond

This 0.51ct natural oval sits in the half to three-quarter carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1518186849. Listed at 13 retailers as of November 1, 2026, with prices from £640 to £1,272, a £632 spread on the same certified stone. MOH London lists it at £1,272. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
G
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
Crown angle38.39°
Pavilion angle39.51°
OriginNatural
Grading LabGIA
CertificateGIA 1518186849
Dimensions6.66 × 4.45 × 2.76 mm
L/W Ratio1.50
Culet sizeNone
Key to symbols
Crystal, Cloud
Top View
6.66 mm4.45 mm0.51 ctG / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1518186849
Side View
Table 59.0%Crown 38.39°Girdle: MediumPavilion 39.51°Culet: NoneDepth 62.0%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £1,272 GBP|Low: £640 GBP|High: £2,177 GBP|Avg: £1,037 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 10£640 GBP
Retailer 5£694 GBP
Retailer 8£721 GBP
Retailer 6£801 GBP
Retailer 9£810 GBP
Retailer 3£863 GBP
Retailer 2£977 GBP
Retailer 11£1,044 GBP
Retailer 4£1,072 GBP
MOH London£1,272 GBP
Retailer 7£2,177 GBP

37 data points across 11 retailers

13 retailers£640 GBP to £1,272 GBP

B
Cheapest Retailer
-
£640 GBP
$858 USD
Final sale: no returns
B
Retailer 2
-
£694 GBP
$930 USD
View
B
Retailer 3
-
£702 GBP
$941 USD
View
B
Retailer 4
-
£721 GBP
$966 USD
View
B
Retailer 5
-
£794 GBP
$1,064 USD
View
B
Retailer 6
-
£801 GBP
$1,073 USD
View
B
Retailer 7
-
£810 GBP
$1,085 USD
View
Retailer 8
-
£863 GBP
View
Price last confirmed 33 days ago
B
Retailer 9
-
£977 GBP
€1,247 EUR
View
Retailer 10
-
£1,044 GBP
A$2,152 AUD
View
Price last confirmed 29 days ago
B
Retailer 11
-
£1,072 GBP
ZAR 23,199 ZAR
View
Most Expensive
C
MOH London
137ACB074 · Nov 1
£1,272 GBP
View
11 more retailers have this diamond
Prices start from £640 GBPSave up to £632 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
0.51ct Oval
£640 GBP