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Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1559065480

Certificate GIA 1559065480

Diamond specifications and retailer prices

From $1,700 SGD
As of November 4, 2026
Save $2,248 SGD (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $5,552 SGD at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559065480. Listed at 20 retailers as of November 2, 2026, with a 132% 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

1.00
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 1559065480
Dimensions6.33 × 6.38 × 4.01 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Cavity, Needle, Indented Natural, Natural
Top View
6.33 mm6.38 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1559065480
Side View
Table 58.0%Crown 34.5°Girdle: THN-STKPavilion 41.8°Culet: NoneDepth 63.1%

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: $1,842 SGD|Low: $1,700 SGD|High: $4,035 SGD|Avg: $2,506 SGD|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 5, 2026
Retailer 9$1,700 SGD
Retailer 7$1,795 SGD
Retailer 1$1,842 SGD
Retailer 4$2,168 SGD
Retailer 11$2,200 SGD
Retailer 3$2,274 SGD
Retailer 2$2,428 SGD
Retailer 5$2,491 SGD
Retailer 10$2,744 SGD
Retailer 6$3,064 SGD
Retailer 8$3,948 SGD

28 data points across 11 retailers

20 retailers$1,700 SGD to $3,948 SGD

A
Cheapest Retailer
-
$1,700 SGD
A
Retailer 2
-
$1,795 SGD
View
A
Retailer 3
-
$1,842 SGD
View
B+
Retailer 4
-
$2,145 SGD
View
B+
Retailer 5
-
$2,146 SGD
View
A
Retailer 6
-
$2,168 SGD
View
B+
Retailer 7
-
$2,200 SGD
View
B+
Retailer 8
-
$2,274 SGD
View
Retailer 9
-
$2,276 SGD
View
Price last confirmed 39 days ago
Retailer 10
-
$2,276 SGD
View
Price last confirmed 36 days ago
Retailer 11
-
$2,371 SGD
View
Price last confirmed 10 days ago
Retailer 12
-
$2,382 SGD
View
Price last confirmed 38 days ago
B+
Retailer 13
-
$2,428 SGD
View
B+
Retailer 14
-
$2,491 SGD
View
Retailer 15
-
$2,627 SGD
View
Price last confirmed 39 days ago
Retailer 16
-
$2,627 SGD
View
Price last confirmed 38 days ago
Retailer 17
-
$2,744 SGD
View
Price last confirmed 11 days ago
B
Retailer 18
-
$3,064 SGD
View
B
Retailer 19
-
$3,948 SGD
View
Most Expensive
NZ Jewellers
5a5dec67-3276-44b6-9378-734f69422a74 · Sep 28
$5,552 SGD
$4,347 USD
View
Price last confirmed 39 days ago
19 more retailers have this diamond
Prices start from $1,700 SGDSave up to $2,248 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
1.00ct Round
$1,700 SGD