What are oval grandidierite gemstones?

Oval grandidierite gemstones are rare, natural borosilicate gems, prized for their striking blue-green to greenish-blue hues and trichroic pleochroism, showing dark blue-green, colorless, or dark green depending on the angle. Discovered in Madagascar in 1902, these certified stones, often cut into oval shapes to enhance their brilliance, are among the world’s rarest gems, ideal for unique jewelry.

Are oval grandidierite gemstones natural and untreated?

Yes, oval grandidierite gemstones are typically natural and untreated, valued for their vibrant colors and clarity, ranging from translucent to rare transparent quality. Certifications verify authenticity, and any rare enhancements are disclosed, ensuring transparency for buyers (per,).

What types of jewelry are best suited for oval grandidierite gemstones?

With a Mohs hardness of 7-7.5, oval grandidierite gemstones are durable for rings, earrings, pendants, and necklaces. Their perfect cleavage requires protective settings for rings to prevent chipping, making them ideal for pendants or statement earrings where their elongated oval shape and pleochroic sparkle shine.

What shapes and sizes of oval grandidierite gemstones are available?

Oval grandidierite gemstones are primarily cut into oval shapes to maximize their trichroic color play, with sizes from 3 mm to larger cuts, typically 0.5-2 carats due to rarity. Other shapes like round, cushion, or pear may be available, but oval cuts dominate for their elegance in jewelry settings (per,).

How do I purchase oval grandidierite gemstones from GemSelect?

Visit the oval grandidierite gemstones category, select your preferred loose stone by size, clarity, or color, and complete your purchase with secure checkout and worldwide shipping options, ensuring fast delivery for your jewelry projects.

What color variations exist in oval grandidierite gemstones?

Oval grandidierite gemstones range from soft blue-green to vivid neon blue or greenish-blue, with color intensity tied to iron content. Their trichroic pleochroism displays dark blue-green, colorless/light yellow, or dark green hues depending on the viewing angle, with Madagascar’s Tranomaro stones prized for neon blue tones (per,,).

Are oval grandidierite gemstones in stock and how are they sourced?

All oval grandidierite gemstones are in stock and ready to ship, primarily sourced from Madagascar’s Andrahomana and Tranomaro deposits, with some from Sri Lanka’s Kolonne region. Madagascar’s 2014 Tranomaro find yielded rare transparent stones, ethically sourced to ensure quality and authenticity (per,).

How do oval grandidierite gemstones compare to Paraiba tourmaline?

Oval grandidierite gemstones share a blue-green hue with Paraiba tourmaline but are significantly rarer, with a 1:10,000 gem-quality yield compared to tourmaline’s wider availability. Grandidierite’s trichroic pleochroism and higher hardness (7-7.5 vs. 7-7.5) offer unique color shifts and durability, making it a premium collector’s choice at $50-$1,000/ct versus Paraiba’s $500-$5,000/ct.

How should I care for oval grandidierite gemstones?

Clean oval grandidierite gemstones with warm soapy water and a soft brush, avoiding ultrasonic or steam cleaners due to their cleavage and brittle tenacity. Store separately in a soft cloth or padded box to prevent scratches or chipping, ensuring their rare beauty endures (per,).

Oval Grandidierite Gemstones - Natural, Certified

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Oval Grandidierite Weight

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8.66ct Turquoise Grandidierite, Oval, I1

14.7 x 12.1 mm

$ 284.64

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14.09ct Turquoise Grandidierite, Oval, Translucent

15.9 x 13.2 mm

$ 3,087.40

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6.34ct Turquoise Grandidierite, Oval, Translucent

14.8 x 10.5 mm

$ 182.55

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8.02ct Turquoise Grandidierite, Oval, Translucent

14.7 x 10.9 mm

$ 230.92

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10.79ct Turquoise Grandidierite, Oval, Translucent

18 x 13 mm (calibrated)

$ 1,182.15

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3.53ct Turquoise Grandidierite, Oval, SI

10.9 x 9.4 mm

$ 154.70

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6.72ct Turquoise Grandidierite, Oval, Translucent

14 x 10 mm (calibrated)

$ 193.48

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2.06ct Turquoise Grandidierite, Oval, Translucent

9 x 6 mm (calibrated)

$ 49.43

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6.41ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 1,053.42

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2.07ct Turquoise Grandidierite, Oval, Translucent

9 x 7 mm (calibrated)

$ 59.60

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5.27ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 404.17

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.4 x 8.2 mm

$ 236.98

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7.32ct Turquoise Grandidierite, Oval, Translucent

13 x 11 mm (calibrated)

$ 1,603.96

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8.15ct Turquoise Grandidierite, Oval, Translucent

14.4 x 10.6 mm

$ 234.66

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11.72ct Turquoise Grandidierite, Oval, Translucent

14.8 x 12.9 mm

$ 2,568.09

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1.40ct Turquoise Grandidierite, Oval, Translucent

8 x 6.5 mm

$ 453.58

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1.50ct Turquoise Grandidierite, Oval, Translucent

8 x 6 mm (calibrated)

$ 43.18

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8.65ct Turquoise Grandidierite, Oval, Translucent

15 x 11.8 mm

$ 249.05

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1.64ct Turquoise Grandidierite, Oval, SI

8.4 x 7 mm

$ 59.89

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14.47ct Turquoise Grandidierite, Oval, Translucent

16.5 x 12.7 mm

$ 475.60

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3.64ct Turquoise Grandidierite, Oval, Translucent

12 x 8 mm (calibrated)

$ 398.80

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3.04ct Turquoise Grandidierite, Oval, SI

10 x 8 mm (calibrated)

$ 121.11

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7.22ct Turquoise Grandidierite, Oval, Translucent

13.9 x 10.7 mm

$ 1,582.05

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6.33ct Turquoise Grandidierite, Oval, Translucent

14 x 10 mm (calibrated)

$ 1,387.03

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Why Buy Oval Grandidierite from GemSelect?

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GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 9

Will know more once order received

Posted By Jim in September, 2025

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Overall Rating -> 7

easy interface for a pricless buy

Posted By Zeak in May, 2026

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Overall Rating -> 10

Enjoy every moment

Posted By Ferns in October, 2025

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Overall Rating -> 10

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025

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Overall Rating -> 10

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026

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Overall Rating -> 10

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

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