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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Oval Grandidierite Price

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2.58ct Turquoise Grandidierite, Oval, SI

10 x 8 mm (calibrated)

$ 113.06

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9.05ct Turquoise Grandidierite, Oval, Translucent

14 x 10.5 mm

$ 694.06

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2.10ct Turquoise Grandidierite, Oval, Translucent

9 x 7 mm (calibrated)

$ 50.39

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9.18ct Turquoise Grandidierite, Oval, Translucent

15 x 10 mm (calibrated)

$ 2,011.52

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3.24ct Turquoise Grandidierite, Oval, Translucent

10 x 8 mm (calibrated)

$ 225.89

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1.07ct Turquoise Grandidierite, Oval, Translucent

8.5 x 5.1 mm

$ 58.61

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3.56ct Turquoise Grandidierite, Oval, SI

11.6 x 8.7 mm

$ 156.02

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4.28ct Turquoise Grandidierite, Oval, VS-SI

11 x 9.5 mm

$ 187.56

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2.75ct Turquoise Grandidierite, Oval, Translucent

10.7 x 7.5 mm

$ 150.65

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9.75ct Turquoise Grandidierite, Oval, Translucent

14.6 x 10.7 mm

$ 2,136.42

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11.77ct Turquoise Grandidierite, Oval, Translucent

16.9 x 13.8 mm

$ 902.67

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10.62ct Turquoise Grandidierite, Oval, SI

15.3 x 13.1 mm

$ 349.06

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12.95ct Turquoise Grandidierite, Oval, Translucent

17 x 13.9 mm

$ 2,837.60

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11.06ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 2,423.47

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2.44ct Turquoise Grandidierite, Oval, Translucent

9.1 x 7.5 mm

$ 453.58

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3.37ct Turquoise Grandidierite, Oval, Translucent

10.4 x 8.3 mm

$ 184.61

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1.35ct Turquoise Grandidierite, Oval, Translucent

8.5 x 6 mm

$ 38.88

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1.40ct Turquoise Grandidierite, Oval, Translucent

8.1 x 6.6 mm

$ 40.30

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1.15ct Turquoise Grandidierite, Oval, Transparent

9 x 6 mm (calibrated)

$ 63.00

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3.45ct Turquoise Grandidierite, Oval, Translucent

11.5 x 9.3 mm

$ 90.30

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2.29ct Turquoise Grandidierite, Oval, SI

9 x 7 mm (calibrated)

$ 100.36

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2.86ct Turquoise Grandidierite, Oval, Translucent

11.4 x 7.6 mm

$ 142.43

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8.97ct Turquoise Grandidierite, Oval, Translucent

13 x 11 mm (calibrated)

$ 1,965.51

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.6 x 7.4 mm

$ 169.27

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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 -> 10

Great prices!!! High quality gemstones.

Posted By Ricky in October, 2025

Source: Bizrate

Overall Rating -> 10

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025

Source: Bizrate

Overall Rating -> 10

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026

Source: Bizrate

Overall Rating -> 8

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 2025

Source: Bizrate

Overall Rating -> 10

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025

Source: Bizrate

Overall Rating -> 10

I could see the actual gem I was buying

Posted By Bugs in December, 2025

Source: Bizrate

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