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

Grandidierite

Oval Grandidierite Weight

Oval Grandidierite Size

Oval Grandidierite Clarity

Oval Grandidierite Price

Size Explained

Choose Size or Size Range

For Example: 6-7

For Example: 8-9

Bi-color

Black

Blue

Brown

Golden

Gray

Green

Multicolor

Orange

Pink

Purple

Red

Turquoise Oval Grandidierite

Violet

White

Yellow

Single

Pairs

Lots

Faceted

Cabochons

Clear All

1.21ct Turquoise Grandidierite, Oval, Translucent

7.1 x 6.6 mm

$ 453.58

View Gem

5.27ct Turquoise Grandidierite, Oval, Translucent

12 x 10 mm (calibrated)

$ 404.17

View Gem

1.64ct Turquoise Grandidierite, Oval, SI

8.4 x 7 mm

$ 59.89

View Gem

9.18ct Turquoise Grandidierite, Oval, Translucent

15 x 10 mm (calibrated)

$ 2,011.52

View Gem

2.29ct Turquoise Grandidierite, Oval, SI

9 x 7 mm (calibrated)

$ 100.36

View Gem

8.65ct Turquoise Grandidierite, Oval, Translucent

15 x 11.8 mm

$ 249.05

View Gem

7.22ct Turquoise Grandidierite, Oval, Translucent

13.9 x 10.7 mm

$ 1,582.05

View Gem

4.58ct Turquoise Grandidierite, Oval, Translucent

11.5 x 8.9 mm

$ 1,003.57

View Gem

2.98ct Turquoise Grandidierite, Oval, Translucent

10.3 x 8.7 mm

$ 412.34

View Gem

9.51ct Turquoise Grandidierite, Oval, Translucent

14.7 x 11.1 mm

$ 273.81

View Gem

9.75ct Turquoise Grandidierite, Oval, Translucent

14.6 x 10.7 mm

$ 2,136.42

View Gem

6.01ct Turquoise Grandidierite, Oval, SI-I1

12.7 x 10.1 mm

$ 197.54

View Gem

8.54ct Turquoise Grandidierite, Oval, Translucent

13.4 x 10.1 mm

$ 233.91

View Gem

17.66ct Turquoise Grandidierite, Oval, Translucent

18 x 13 mm (calibrated)

$ 580.45

View Gem

2.75ct Turquoise Grandidierite, Oval, VS-SI

9.5 x 8.1 mm

$ 361.55

View Gem

11.77ct Turquoise Grandidierite, Oval, Translucent

16.9 x 13.8 mm

$ 902.67

View Gem

3.56ct Turquoise Grandidierite, Oval, SI

11.5 x 8.8 mm

$ 156.02

View Gem

3.15ct Turquoise Grandidierite, Oval, SI-I1

10.9 x 9.5 mm

$ 115.04

View Gem

14.09ct Turquoise Grandidierite, Oval, Translucent

15.9 x 13.2 mm

$ 3,087.40

View Gem

3.24ct Turquoise Grandidierite, Oval, Translucent

10 x 8 mm (calibrated)

$ 225.89

View Gem

2.10ct Turquoise Grandidierite, Oval, Translucent

9 x 7 mm (calibrated)

$ 50.39

View Gem

18.89ct Turquoise Grandidierite, Oval, Translucent

18 x 14 mm

$ 620.87

View Gem

3.53ct Turquoise Grandidierite, Oval, SI

10.9 x 9.4 mm

$ 154.70

View Gem

10.64ct Turquoise Grandidierite, Oval, Translucent

14 x 12 mm (calibrated)

$ 349.71

View Gem

« 1 2 3 »

Choose Page

1 - 6

Why Buy Oval Grandidierite from GemSelect?

Trusted Worldwide Since 2003
Supplying natural gemstones to jewelers and collectors in 120+ countries
Verified natural gemstones
View All GemSelect Reviews on Bizrate
Secure checkout and insured worldwide delivery
30-day returns and satisfaction guarantee

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10

So far So good

Posted By VH-1 in July, 2025

Source: Bizrate

Overall Rating -> 10

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026

Source: Bizrate

Overall Rating -> 9

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025

Source: Bizrate

Overall Rating -> 10

overall great

Posted By SR in April, 2026

Source: Bizrate

Overall Rating -> 10

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025

Source: Bizrate

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

Source: Bizrate

→ View All GemSelect Reviews on Bizrate