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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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

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Overall Rating -> 10

Love, and have always loved, your website.

Posted By Aberabic in July, 2025

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Overall Rating -> 10

I always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025

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Overall Rating -> 10

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

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Overall Rating -> 10

Great experience. I can't wait to explore on the website further.

Posted By Kymmie in September, 2025

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Overall Rating -> 10

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026

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Overall Rating -> 8

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026

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