Electric Blue Zircon Pair - Ratanakiri, Cambodia - 3.51ct (Total)

• Gemstone: Natural Blue Zircon
• Species / Variety: Zircon
• Color: Electric Cyan / Swiss Blue
• Tone & Saturation: Medium Tone / High Saturation
• Origin: Ratanakiri, Cambodia
• Total Carat Weight: 3.51 ct
• Number of Stones: 2
• Average Weight: ~1.76 ct per stone
• Shape: Marquise
• Cut: Brilliant
• Dimensions: 9.50 × 5.00 mm each
• Clarity: VVS, estimated
• Transparency: Transparent
• Optical Character: Strong birefringence with pronounced facet doubling
• Dispersion: High
• Treatment: Heated / Thermally Enhanced
• Hardness: Mohs 7.5

The pair presents a vivid electric cyan-blue reminiscent of intense Swiss or neon blue, with subtle teal flashes appearing as the stones rotate.

Zircon's exceptionally high refractive indices and strong dispersion produce substantial fire, while its pronounced birefringence creates visible doubling of pavilion facets. This combination gives the stones a distinctive optical depth that separates fine zircon from visually similar blue gemstones.

The matched color and outline allow these optical effects to operate consistently across the pair, particularly when viewed in motion.

Both stones exhibit excellent transparency and an eye-clean appearance, with an estimated VVS clarity based on visual and macro inspection.

The marquise brilliant cuts maintain a consistent 9.50 × 5.00 mm outline and approximately 1.90:1 length-to-width ratio. The matching symmetry between the stones extends beyond overall dimensions to their girdle profiles and facet reflection patterns.

The elongated format makes the pair particularly versatile for earrings and other symmetrical designs where vertical movement and visual length are desirable.

The blue color is produced through heat treatment of natural zircon, a well-established treatment used to transform suitable Cambodian zircon into vivid blue material.

The treatment does not change the fact that the underlying gemstone is natural zircon, but the blue color should be described as thermally enhanced rather than untreated or naturally blue.

Zircon has a Mohs hardness of approximately 7.5 but is relatively brittle and can develop facet-edge abrasion. The pointed marquise terminations require particular protection during setting.

Protective V-prongs or a bezel-style construction are recommended at the points. Avoid harsh mechanical setting pressure, abrupt thermal shock, and routine ultrasonic cleaning.

The pair is represented as originating from Ratanakiri, Cambodia, a historically important source of zircon.

Cambodian zircon is particularly well known for material that can be transformed through heat treatment into vivid blue hues. The combination of Cambodian provenance and the resulting electric blue color is characteristic of an important commercial category of zircon.

The principal attraction of this pair is its combination of electric color, optical fire, and matched architectural proportions.

At approximately 1.76 carats each, the stones have sufficient presence to function as primary elements rather than merely accents. The 9.50 × 5.00 mm marquise format provides considerable visual length while retaining a manageable total weight.

As a matched pair, the stones are especially appropriate for earrings, symmetrical ear ornaments, twin-stone rings, or other designs where repetition and reflection are integral to the composition.

Independent gemological laboratory verification of natural zircon identity, treatment, and geographic origin may be arranged upon request.

Every stone offered by the House is selected for more than nominal rarity. Color, proportion, clarity, cutting, material integrity, and the way a gemstone responds to light are considered together.

At Dante Bianco, a gemstone is not simply a measure of carat weight or a line on an inventory sheet. It is a material with its own optical character, physical structure, and potential within a considered design. Each stone is chosen for the qualities that make it worthy of attention and for the possibilities it presents to the collector who recognizes them.