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Round|Natural|GIA

1.09ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1559989727

Certificate GIA 1559989727

Diamond specifications and retailer prices

From $4,788 SGD
$3,745 USD
As of October 30, 2026
Save $4,371 SGD (48%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $9,158 SGD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.09ct natural round diamond

This 1.09ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559989727. Listed at 10 retailers as of October 30, 2026, with prices from $4,788 to $9,158, a $4,371 spread on the same certified stone. NZ Jewellers lists it at $9,158. 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

1.09
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1559989727
Dimensions6.51 × 6.54 × 4.08 mm
L/W Ratio1.00
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
6.51 mm6.54 mm1.09 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559989727
Side View
Table 58.0%Crown 36°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 62.6%

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 30
Current: $9,158 SGD|Low: $4,788 SGD|High: $9,158 SGD|Avg: $6,352 SGD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 8$4,788 SGD
Retailer 3$5,074 SGD
Retailer 6$5,257 SGD
Retailer 9$5,257 SGD
Retailer 2$5,261 SGD
Retailer 7$5,440 SGD
Retailer 10$5,637 SGD
Retailer 4$5,928 SGD
Retailer 5$8,839 SGD
NZ Jewellers$9,158 SGD

42 data points across 10 retailers

10 retailers$4,788 SGD to $9,158 SGD

B+
Cheapest Retailer
-
$4,788 SGD
$3,745 USD
B+
Retailer 2
-
$5,074 SGD
£3,125 GBP
View
B+
Retailer 3
-
$5,257 SGD
$4,112 USD
View
B+
Retailer 4
-
$5,257 SGD
$4,112 USD
View
B+
Retailer 5
-
$5,261 SGD
$4,115 USD
View
B+
Retailer 6
-
$5,440 SGD
$4,255 USD
View
Retailer 7
-
$5,637 SGD
A$6,783 AUD
View
Price last confirmed 27 days ago
B+
Retailer 8
-
$5,928 SGD
$4,637 USD
View
B
Retailer 9
-
$8,839 SGD
£5,444 GBP
View
Most Expensive
B
NZ Jewellers
7041e401-7015-401a-b08f-55c343acc911 · Oct 30
$9,158 SGD
$7,164 USD
View
9 more retailers have this diamond
Prices start from $4,788 SGDSave up to $4,371 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.

B+
1.09ct Round
$4,788 SGD