Oval|Natural|GIA

0.51ct D SI1 Oval Natural Diamond

EX • D/SI1 • GIA 1493017308

Certificate GIA 1493017308

Diamond specifications and retailer prices

From £633 GBP
$848 USD
As of October 29, 2026
Save £763 GBP (55%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,849 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.51ct natural oval diamond

This 0.51ct natural oval sits in the half to three-quarter carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1493017308. Listed at 20 retailers as of October 29, 2026, with a 121% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

0.51
Carat
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1493017308
Dimensions6.36 × 4.56 × 2.86 mm
L/W Ratio1.39
Culet sizeNone
Key to symbols
Crystal
Top View
6.36 mm4.56 mm0.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1493017308
Side View
Table 62.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.8%

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 29
Current: £1,849 GBP|Low: £633 GBP|High: £1,877 GBP|Avg: £917 GBP|-1.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
October 31, 2026
Retailer 9£633 GBP
Retailer 16£634 GBP
Retailer 8£674 GBP
Retailer 5£687 GBP
Retailer 11£687 GBP
Retailer 6£695 GBP
Retailer 17£713 GBP
Retailer 7£761 GBP
Retailer 4£793 GBP
Retailer 18£802 GBP
Retailer 3£836 GBP
Retailer 19£836 GBP
Retailer 20£866 GBP
Retailer 2£889 GBP
Retailer 10£999 GBP
Retailer 13£1,009 GBP
Retailer 12£1,021 GBP
Retailer 14£1,170 GBP
Retailer 15£1,396 GBP
NZ Jewellers£1,849 GBP

39 data points across 20 retailers

20 retailers£633 GBP to £1,396 GBP

B+
Cheapest Retailer
-
£633 GBP
$848 USD
Final sale: no returns
Retailer 2
-
£634 GBP
$850 USD
View
Price last confirmed 10 days ago
B+
Retailer 3
-
£674 GBP
$903 USD
View
B+
Retailer 4
-
£687 GBP
$920 USD
View
B+
Retailer 5
-
£687 GBP
$920 USD
View
B+
Retailer 6
-
£695 GBP
$931 USD
View
B+
Retailer 7
-
£713 GBP
$956 USD
View
B+
Retailer 8
-
£761 GBP
$1,020 USD
View
B+
Retailer 9
-
£793 GBP
$1,062 USD
View
B+
Retailer 10
-
£802 GBP
$1,075 USD
View
B+
Retailer 11
-
£836 GBP
$1,120 USD
View
B+
Retailer 12
-
£836 GBP
$1,120 USD
View
B+
Retailer 13
-
£866 GBP
$1,160 USD
View
B+
Retailer 14
-
£889 GBP
View
B
Retailer 15
-
£999 GBP
$1,339 USD
View
B
Retailer 16
-
£1,009 GBP
€1,288 EUR
View
Retailer 17
-
£1,021 GBP
A$2,105 AUD
View
Price last confirmed 26 days ago
B
Retailer 18
-
£1,170 GBP
ZAR 25,330 ZAR
View
B
Retailer 19
-
£1,396 GBP
View
Most Expensive
NZ Jewellers
3360d27d-0a55-485c-bf6c-69e6653dbffb · Oct 30
£1,849 GBP
$2,477 USD
View
Price under review
19 more retailers have this diamond
Prices start from £633 GBPSave up to £763 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
£633 GBP