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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13.98ct Turquoise Grandidierite, Oval, SI

16.5 x 13.7 mm

$ 7,658.24

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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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4.65ct Turquoise Grandidierite, Oval, Opaque

11.7 x 8.7 mm

$ 324.20

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3.31ct Turquoise Grandidierite, Oval, Translucent

9.8 x 8.5 mm

$ 725.29

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3.39ct Turquoise Grandidierite, Oval, VS-SI

10 x 8 mm (calibrated)

$ 148.56

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7.32ct Turquoise Grandidierite, Oval, Translucent

13 x 11 mm (calibrated)

$ 1,603.96

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2.88ct Turquoise Grandidierite, Oval, Translucent

10 x 8 mm (calibrated)

$ 157.77

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6.02ct Turquoise Grandidierite, Oval, Translucent

13 x 9 mm (calibrated)

$ 986.04

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.6 x 7.4 mm

$ 169.27

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6.41ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 1,053.42

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12.95ct Turquoise Grandidierite, Oval, Translucent

17 x 13.9 mm

$ 2,837.60

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11.10ct Turquoise Grandidierite, Oval, Translucent

14.8 x 13.3 mm

$ 364.83

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1.09ct Turquoise Grandidierite, Oval, Translucent

7.1 x 6.6 mm

$ 453.58

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1.35ct Turquoise Grandidierite, Oval, Translucent

8.5 x 6 mm

$ 38.88

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2.53ct Turquoise Grandidierite, Oval, Translucent

10.7 x 6.9 mm

$ 138.59

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1.77ct Turquoise Grandidierite, Oval, VS-SI

8.5 x 6.7 mm

$ 969.61

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6.34ct Turquoise Grandidierite, Oval, Translucent

14.8 x 10.5 mm

$ 182.55

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1.82ct Turquoise Grandidierite, Oval, Translucent

8.6 x 6.5 mm

$ 52.40

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2.86ct Turquoise Grandidierite, Oval, Translucent

11.1 x 8.4 mm

$ 313.34

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5.96ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 1,305.96

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5.25ct Turquoise Grandidierite, Oval, Translucent

13.3 x 9.9 mm

$ 402.63

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3.78ct Turquoise Grandidierite, Oval, Translucent

11.4 x 8.5 mm

$ 828.27

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Why Buy Oval Grandidierite from GemSelect?

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GemSelect Certified Store Reviews

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Overall Rating -> 10

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025

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Overall Rating -> 9

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

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Overall Rating -> 10

I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

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Overall Rating -> 10

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Overall Rating -> 10

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Overall Rating -> 10

So far So good

Posted By VH-1 in July, 2025

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