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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11.74ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 2,572.47

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6.31ct Turquoise Grandidierite, Oval, SI-I1

13 x 11 mm (calibrated)

$ 283.45

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14.98ct Turquoise Grandidierite, Oval, SI-I1

17.5 x 14.6 mm

$ 672.90

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13.98ct Turquoise Grandidierite, Oval, SI

16.5 x 13.7 mm

$ 7,658.24

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5.05ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 132.18

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6.92ct Turquoise Grandidierite, Oval, Translucent

12.6 x 10 mm

$ 1,516.31

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5.14ct Turquoise Grandidierite, Oval, VS-SI

11.5 x 9.5 mm

$ 225.25

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3.56ct Turquoise Grandidierite, Oval, SI

11.5 x 8.8 mm

$ 156.02

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5.61ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 161.52

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3.78ct Turquoise Grandidierite, Oval, Translucent

11.4 x 8.5 mm

$ 828.27

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6.16ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 674.89

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5.25ct Turquoise Grandidierite, Oval, Translucent

13.3 x 9.9 mm

$ 402.63

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1.77ct Turquoise Grandidierite, Oval, VS-SI

8.5 x 6.7 mm

$ 969.61

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1.82ct Turquoise Grandidierite, Oval, Translucent

8.6 x 6.5 mm

$ 52.40

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1.09ct Turquoise Grandidierite, Oval, Translucent

7.1 x 6.6 mm

$ 453.58

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3.31ct Turquoise Grandidierite, Oval, Translucent

9.8 x 8.5 mm

$ 725.29

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2.53ct Turquoise Grandidierite, Oval, Translucent

9.3 x 8 mm

$ 138.59

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10.64ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 349.71

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8.85ct Turquoise Grandidierite, Oval, SI-I1

14 x 12 mm (calibrated)

$ 290.88

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22.15ct Turquoise Grandidierite, Oval, Translucent

16.8 x 15.1 mm

$ 728.03

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4.31ct Turquoise Grandidierite, Oval, SI

12 x 10 mm (calibrated)

$ 188.88

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4.97ct Turquoise Grandidierite, Oval, SI

11.7 x 10.4 mm

$ 217.81

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3.39ct Turquoise Grandidierite, Oval, VS-SI

10 x 8 mm (calibrated)

$ 148.56

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18.89ct Turquoise Grandidierite, Oval, Translucent

18 x 14 mm

$ 620.87

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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 -> 8

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025

Source: Bizrate

Overall Rating -> 10

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026

Source: Bizrate

Overall Rating -> 8

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025

Source: Bizrate

Overall Rating -> 10

It was all good

Posted By Debsarabs in February, 2026

Source: Bizrate

Overall Rating -> 10

Absolutely love the website, selection and products. Can you guys add a gemstones with inclusions tab. I like those it'd be nice to have them all in one place but i do understand it would be alot of work to go through and categorize them. Thank you anyways

Posted By The homie edgar in December, 2025

Source: Bizrate

Overall Rating -> 10

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025

Source: Bizrate

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