Cobalt Blue Zircon 51.15ct - 20mm
Cobalt Blue Zircon 51.15ct - 20mm
Cobalt Blue Zircon 51.15ct - 20mm
US$ 47,045
51.15ct Blue Zircon at US$ 920/ct
Certification?
| Weight | 51.15 ct |
| Shape / Cut | Trilliant / Fine Step Cut |
| Color | Cobalt Blue |
| Clarity | VVS |
| Treatment | None |
| Origin | Cambodia |
| Dimensions | 20.15 x 19.97 x 14.83 mm |
Buy with Confidence
01Natural only
Only natural, earth-mined gemstones — never synthetic or laboratory-created.
Since 1985
A second-generation family gemstone house, cutting and selling from Bangkok.
Described as it is
Hand-selected and described accurately, with any known treatment disclosed.
Secure checkout
Encrypted end to end, so your payment details stay protected.
Anatomy of This Stone
02Colour
Cobalt Blue
Indicative tonal range for this colour family. For reference only — screens vary.
This 51.15ct blue zircon sits in the cobalt blue range of the blue zircon colour scale.
Clarity
VVS
This 51.15ct blue zircon is graded VVS. Very Very Slightly Included: inclusions are extremely difficult to see under 10x magnification.
Shape & size
Trilliant
20.15 × 19.97 × 14.83 mm
This 51.15ct blue zircon measures 20.15 × 19.97 × 14.83 mm, shown here at true physical size on most screens. Carat weight describes a gemstone's mass rather than its dimensions, so always check the millimetres before buying.
Price
Our price
US$ 47,045
US$ 920 / carat
Retail price
US$ 94,090
STARLANKA buys rough at source and cuts it in-house in Bangkok, so a stone reaches you without the layers of margin a blue zircon normally collects between the mine and a retail counter. The price shown is the price — no negotiated tiers.
Retail price is our estimate of what a comparable stone typically costs at traditional retail. It is a comparison figure — not a former price at which this stone was offered.
Certification & Shipping
03Certification
No lab report supplied
This 51.15ct blue zircon is not currently accompanied by an independent lab report. One can be added before it ships — choose a laboratory from the certification option in the buy box above. Certification is optional: many clients buy on our own description, which stands behind the 14-day return either way.
- GIA
- GRS
- AIGS
- GIT
- ICA GemLab
- GUILD
- AGR
Reports are issued by the laboratory directly and describe the stone independently of us. Our affiliations.
Shipping & returns
Free and fully insured, worldwide
In the box
Sealed gem box, itemised invoice, and the lab report where one accompanies the stone.
Returns
14 days from delivery. We send a prepaid insured label and refund the original payment method.
Voids a return
The stone has been set, the seal broken, or the stone altered or recut.
Dispatched within 1–3 business days. Full detail in our shipping and return policies.
Frequently Asked Questions
04Is this blue zircon natural or lab-created?
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This STARLANKA blue zircon (SKU ZI0786) is a natural, earth-mined blue zircon. STARLANKA sells only natural gemstones and does not offer synthetic or laboratory-created stones.
Has this blue zircon been treated?
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This STARLANKA blue zircon (SKU ZI0786) is untreated. It is sold as a natural, untreated blue zircon, with no heat or enhancement of any kind.
Does this stone come with a certificate?
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This STARLANKA blue zircon (SKU ZI0786) is not currently accompanied by an independent lab report. A report from GIA, GRS, AIGS, GIT, ICA GemLab, GUILD or AGR can be added before the stone ships.
What size is a 51.15ct trilliant blue zircon?
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This STARLANKA blue zircon (SKU ZI0786) weighs 51.15 carats and measures 20.15 × 19.97 × 14.83 mm. Carat weight describes a gemstone's mass rather than its dimensions, so two stones of equal weight can differ in face-up size depending on shape and cut depth.
How much does shipping cost?
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STARLANKA ships this blue zircon (SKU ZI0786) free of charge and fully insured worldwide, with no minimum order value. Orders are dispatched within 1–3 business days: 2–4 business days in transit to the United States by international express courier, 3–7 business days elsewhere internationally, and 1 business day within Thailand by local express courier.
Can I return this blue zircon?
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This STARLANKA blue zircon (SKU ZI0786) can be returned within 14 days of delivery for a refund to the original payment method, provided it has not been set into jewellery, had its security seal broken, or been altered or recut. STARLANKA provides a prepaid, insured return label.
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Blue Zircon Reviews(21)
“Beautiful gem, great cut and color”
Verified buyer·Mar 5, 2024
Mar 5, 2024
“Nice gemstones and great customer service! Plan to work with again”
Verified buyer·Nov 27, 2023
Nov 27, 2023
“The stones were in great condition and quality.”
Verified buyer·Nov 4, 2023
Nov 4, 2023
“Definitely the nicest cut stone that I have bought. I will stick with Starlanka from now on. You get what you ordered. Not like other sites where what you get is not like what you see online.”
Verified buyer·Aug 19, 2023
Aug 19, 2023
“Accurate report.”
Verified buyer·Feb 10, 2023
Feb 10, 2023
“Great service and craftsmanship! Very happy with my purchase!!”
Verified buyer·Jul 28, 2022
Jul 28, 2022
Verified buyer·Jul 18, 2022
Jul 18, 2022
