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Marquise|Natural|GIA

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 6555746979

Certificate GIA 6555746979

Diamond specifications and retailer prices

From $463 SGD
$362 USD
As of November 2, 2026
Save $1,645 SGD (78%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $2,108 SGD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555746979. Listed at 21 retailers as of October 30, 2026, with a 355% 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555746979
Dimensions7.94 × 4.07 × 2.61 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud
Top View
7.94 mm4.07 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555746979
Side View
Table 63.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 64.2%

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 2
Current: $673 SGD|Low: $463 SGD|High: $1,571 SGD|Avg: $872 SGD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 11$463 SGD
Retailer 4$496 SGD
Retailer 1$673 SGD
Retailer 3$673 SGD
Retailer 9$724 SGD
Retailer 5$843 SGD
Retailer 10$927 SGD
Retailer 7$1,003 SGD
Retailer 2$1,011 SGD
Retailer 8$1,037 SGD
Retailer 6$1,553 SGD

36 data points across 11 retailers

21 retailers$463 SGD to $2,108 SGD

A
Cheapest Retailer
-
$463 SGD
$362 USD
Final sale: no returns
A
Retailer 2
-
$496 SGD
₹36,928 INR
View
Retailer 3
-
$673 SGD
$526 USD
View
Price last confirmed 35 days ago
A
Retailer 4
-
$673 SGD
$526 USD
View
Retailer 5
-
$673 SGD
$526 USD
View
Price last confirmed 15 days ago
A
Retailer 6
-
$673 SGD
$526 USD
View
Retailer 7
-
$724 SGD
$566 USD
View
Price last confirmed 17 days ago
A
Retailer 8
-
$724 SGD
$566 USD
View
Retailer 9
-
$724 SGD
$566 USD
View
Price last confirmed 18 days ago
Retailer 10
-
$775 SGD
$606 USD
View
Price last confirmed 35 days ago
Retailer 11
-
$775 SGD
$606 USD
View
Price last confirmed 24 days ago
B+
Retailer 12
-
$840 SGD
$657 USD
View
B+
Retailer 13
-
$843 SGD
£519 GBP
View
B+
Retailer 14
-
$927 SGD
$725 USD
View
B+
Retailer 15
-
$1,003 SGD
€747 EUR
View
Retailer 16
-
$1,011 SGD
A$1,216 AUD
View
Price last confirmed 30 days ago
B+
Retailer 17
-
$1,037 SGD
ZAR 13,104 ZAR
View
B
Retailer 18
-
$1,553 SGD
£956 GBP
View
Retailer 19
-
$2,108 SGD
$1,648 USD
View
Price last confirmed 35 days ago
B
Retailer 20
-
$2,108 SGD
$1,648 USD
View
Most Expensive
NZ Jewellers
27bca978-5464-459d-9f2b-309afb09e2c7 · Oct 17
$2,108 SGD
$1,648 USD
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from $463 SGDSave up to $1,645 SGD

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
0.51ct Marquise
$463 SGD