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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3.57ct Turquoise Grandidierite, Oval, VS-SI

11 x 9 mm (calibrated)

$ 156.46

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12.41ct Turquoise Grandidierite, Oval, SI-I1

15.6 x 13.3 mm

$ 407.90

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3.37ct Turquoise Grandidierite, Oval, SI-I1

11.6 x 8.8 mm

$ 147.69

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2.64ct Turquoise Grandidierite, Oval, SI

10.9 x 8 mm

$ 115.69

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2.75ct Turquoise Grandidierite, Oval, VS-SI

9.5 x 8.1 mm

$ 361.55

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2.17ct Turquoise Grandidierite, Oval, Translucent

9 x 6.4 mm

$ 62.48

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19.52ct Turquoise Grandidierite, Oval, Translucent

17.3 x 14.2 mm

$ 2,138.61

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1.97ct Turquoise Grandidierite, Oval, Translucent

8 x 6.8 mm

$ 431.67

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4.32ct Turquoise Grandidierite, Oval, Translucent

11.2 x 8.5 mm

$ 301.19

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22.47ct Turquoise Grandidierite, Oval, Translucent

21 x 15.5 mm

$ 1,723.27

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2.98ct Turquoise Grandidierite, Oval, Translucent

10.3 x 8.7 mm

$ 412.34

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1.86ct Turquoise Grandidierite, Oval, Translucent

8.3 x 6.7 mm

$ 101.89

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1.64ct Turquoise Grandidierite, Oval, Translucent

9 x 6 mm (calibrated)

$ 453.58

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6.02ct Turquoise Grandidierite, Oval, Translucent

13 x 9 mm (calibrated)

$ 986.04

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2.67ct Turquoise Grandidierite, Oval, Translucent

10 x 8 mm (calibrated)

$ 292.53

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4.21ct Turquoise Grandidierite, Oval, Translucent

11.3 x 9.4 mm

$ 121.21

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6.91ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 1,514.12

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12.29ct Turquoise Grandidierite, Oval, Translucent

17.1 x 12.8 mm

$ 403.94

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1.40ct Turquoise Grandidierite, Oval, Translucent

7.5 x 6.3 mm

$ 69.72

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11.10ct Turquoise Grandidierite, Oval, Translucent

14.8 x 13.3 mm

$ 364.83

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6.15ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 177.07

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2.51ct Turquoise Grandidierite, Oval, SI

10.4 x 7.6 mm

$ 110.00

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9.51ct Turquoise Grandidierite, Oval, Translucent

14.7 x 11.1 mm

$ 273.81

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5.05ct Turquoise Grandidierite, Oval, Translucent

13 x 9 mm (calibrated)

$ 352.09

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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

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026

Source: Bizrate

Overall Rating -> 10

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026

Source: Bizrate

Overall Rating -> 10

I love the products. I've bought them as gifts and people love my gifts

Posted By Love it! in February, 2026

Source: Bizrate

Overall Rating -> 10

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026

Source: Bizrate

Overall Rating -> 10

Easy process.

Posted By Crafty Seabee in March, 2026

Source: Bizrate

Overall Rating -> 10

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026

Source: Bizrate

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