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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8.85ct Turquoise Grandidierite, Oval, SI-I1

14 x 12 mm (calibrated)

$ 290.88

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1.07ct Turquoise Grandidierite, Oval, Translucent

8.5 x 5.1 mm

$ 58.61

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3.04ct Turquoise Grandidierite, Oval, SI

10 x 8 mm (calibrated)

$ 121.11

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12.41ct Turquoise Grandidierite, Oval, SI-I1

15.6 x 13.3 mm

$ 407.90

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22.15ct Turquoise Grandidierite, Oval, Translucent

16.8 x 15.1 mm

$ 728.03

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8.54ct Turquoise Grandidierite, Oval, Translucent

13.4 x 10.1 mm

$ 233.91

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2.88ct Turquoise Grandidierite, Oval, Translucent

10 x 8 mm (calibrated)

$ 157.77

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2.44ct Turquoise Grandidierite, Oval, Translucent

9.1 x 7.5 mm

$ 453.58

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4.32ct Turquoise Grandidierite, Oval, Translucent

11.2 x 8.5 mm

$ 301.19

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.4 x 8.2 mm

$ 236.98

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9.18ct Turquoise Grandidierite, Oval, Translucent

15 x 10 mm (calibrated)

$ 2,011.52

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6.15ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 177.07

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6.01ct Turquoise Grandidierite, Oval, SI-I1

12.7 x 10.1 mm

$ 197.54

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2.75ct Turquoise Grandidierite, Oval, Translucent

10.7 x 7.5 mm

$ 150.65

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2.86ct Turquoise Grandidierite, Oval, Translucent

11.4 x 7.6 mm

$ 142.43

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19.52ct Turquoise Grandidierite, Oval, Translucent

17.3 x 14.2 mm

$ 2,138.61

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2.98ct Turquoise Grandidierite, Oval, Translucent

10.3 x 8.7 mm

$ 412.34

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3.31ct Turquoise Grandidierite, Oval, Translucent

9.8 x 8.5 mm

$ 725.29

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2.93ct Turquoise Grandidierite, Oval, Translucent

9.6 x 8.4 mm

$ 160.51

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.6 x 7.4 mm

$ 169.27

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22.47ct Turquoise Grandidierite, Oval, Translucent

21 x 15.5 mm

$ 1,723.27

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1.64ct Turquoise Grandidierite, Oval, SI

8.4 x 7 mm

$ 59.89

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2.55ct Turquoise Grandidierite, Oval, Translucent

8.5 x 6.9 mm

$ 139.69

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4.58ct Turquoise Grandidierite, Oval, Translucent

11.5 x 8.9 mm

$ 1,003.57

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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

It was all good

Posted By Debsarabs in February, 2026

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Overall Rating -> 10

My whole experience is great.

Posted By Ghs in November, 2025

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Overall Rating -> 9

I've made several purchases over the last 8 years and I've never been less than happy with any of them.

Posted By Jess in July, 2026

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Overall Rating -> 10

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026

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Overall Rating -> 10

Excellent options

Posted By CJ in February, 2026

Source: Bizrate

Overall Rating -> 10

I have made many purchases from GemSelect over the years, and I have a beautiful collection of jewelry as a result. My purchases have always been exactly as described, and I have enjoyed doing business with you.

Posted By MMM in July, 2026

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