CaratHunter
Plans
Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6512424390

Certificate GIA 6512424390

Diamond specifications and retailer prices

From $4,942 SGD
As of November 5, 2026
Save $4,841 SGD (49%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $9,782 SGD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6512424390. Listed at 17 retailers as of November 5, 2026, with prices from $4,942 to $9,782, a $4,841 spread on the same certified stone. NZ Jewellers lists it at $9,782. 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

1.21
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6512424390
Dimensions6.86 × 6.81 × 4.22 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Twinning Wisp, Feather, Needle, Indented Natural
Top View
6.86 mm6.81 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6512424390
Side View
Table 60.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.7%

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: Nov 5
Current: $5,652 SGD|Low: $4,319 SGD|High: $9,275 SGD|Avg: $5,961 SGD|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5$4,979 SGD
Retailer 2$5,097 SGD
Retailer 7$5,183 SGD
Retailer 9$5,337 SGD
Retailer 10$5,615 SGD
Retailer 1$5,652 SGD
Retailer 8$5,989 SGD
Retailer 4$6,312 SGD
Retailer 3$6,850 SGD
Retailer 6$9,165 SGD

45 data points across 10 retailers

17 retailers$4,942 SGD to $9,782 SGD

B+
Cheapest Retailer
-
$4,942 SGD
B+
Retailer 2
-
$4,979 SGD
View
B+
Retailer 3
-
$5,097 SGD
View
B+
Retailer 4
-
$5,183 SGD
View
Final sale: no returns
B+
Retailer 5
-
$5,325 SGD
View
Retailer 6
-
$5,615 SGD
View
Price last confirmed 8 days ago
B
Retailer 7
-
$5,615 SGD
View
B
Retailer 8
-
$5,615 SGD
View
B+
Retailer 9
-
$5,652 SGD
View
B
Retailer 10
-
$5,804 SGD
View
Retailer 11
-
$5,989 SGD
View
Price last confirmed 28 days ago
B
Retailer 12
-
$6,312 SGD
View
B
Retailer 13
-
$6,478 SGD
View
B
Retailer 14
-
$6,850 SGD
View
B
Retailer 15
-
$8,921 SGD
View
B
Retailer 16
-
$9,165 SGD
View
Most Expensive
B
NZ Jewellers
26c924ad-4a91-43a5-8d77-a32aea1d223a · Nov 5
$9,782 SGD
$7,633 USD
View
16 more retailers have this diamond
Prices start from $4,942 SGDSave up to $4,841 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+
1.21ct Round
$4,942 SGD