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Marquise|Natural|GIA

1.70ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 5241036081

Certificate GIA 5241036081

Diamond specifications and retailer prices

From $11,620 AUD
SGD 11,030 SGD
As of November 1, 2026
Save $6,645 AUD (36%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $18,265 AUD at Helzberg Diamonds · As of November 1, 2026
View at Helzberg Diamonds

About this 1.7ct natural marquise diamond

This 1.7ct natural marquise sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5241036081. Listed at 12 retailers as of November 1, 2026, with prices from $11,620 to $18,265, a $6,645 spread on the same certified stone. Helzberg Diamonds lists it at $18,265. 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

1.70
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle39.49°
Pavilion angle38.01°
OriginNatural
Grading LabGIA
CertificateGIA 5241036081
Dimensions12.67 × 5.92 × 3.66 mm
L/W Ratio2.14
Culet sizeNone
Top View
12.67 mm5.92 mm1.70 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 5241036081
Side View
Table 57.0%Crown 39.49°Girdle: MED-THKPavilion 38.01°Culet: NoneDepth 61.8%

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: Nov 1
Current: $18,265 AUD|Low: $11,620 AUD|High: $19,307 AUD|Avg: $14,771 AUD|-5.4%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 9$11,620 AUD
Retailer 7$12,458 AUD
Retailer 10$12,580 AUD
Retailer 8$12,788 AUD
Retailer 11$12,847 AUD
Retailer 5$12,980 AUD
Retailer 3$14,889 AUD
Retailer 12$15,033 AUD
Retailer 4$15,240 AUD
Retailer 6$15,419 AUD
Retailer 2$17,132 AUD
Helzberg Diamonds$18,265 AUD

30 data points across 12 retailers

12 retailers$11,620 AUD to $18,265 AUD

B+
Cheapest Retailer
-
$11,620 AUD
SGD 11,030 SGD
B+
Retailer 2
-
$12,458 AUD
$8,751 USD
View
B+
Retailer 3
-
$12,580 AUD
SGD 11,942 SGD
View
B+
Retailer 4
-
$12,788 AUD
$8,983 USD
View
B+
Retailer 5
-
$12,847 AUD
$9,024 USD
View
B+
Retailer 6
-
$12,980 AUD
£7,179 GBP
View
B
Retailer 7
-
$14,889 AUD
$10,459 USD
View
B
Retailer 8
-
$15,033 AUD
$10,560 USD
View
B+
Retailer 9
-
$15,240 AUD
$10,705 USD
View
B+
Retailer 10
-
$15,419 AUD
€10,315 EUR
View
B
Retailer 11
-
$17,132 AUD
$12,034 USD
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGJMGOH · Nov 1
$18,265 AUD
$12,830 USD
View
11 more retailers have this diamond
Prices start from $11,620 AUDSave up to $6,645 AUD

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+
1.70ct Marquise
$11,620 AUD