Natural Indicolite (Blue Tourmaline) 1.78ct Octagon Cut
€23.00 EURSKU: tu299
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A dark, densely colored indicolite cut as an octagon at 8 by 5.4mm. Seen straight on, the two ends are almost black, while a broad horizontal band across the middle of the stone opens into a clear steel-blue that shifts toward teal at its brightest. That split between near-black and clear blue is the stone showing its two crystal directions at once, and it is the most interesting thing about the piece. A few light polish marks sit on the table and the interior carries natural inclusions consistent with SI clarity.
Tourmaline is strongly dichroic, so blue tourmaline often looks black down one axis and blue down the other. The table here is set to favor the lighter direction, which is what produces the bright central band. This stone is untreated Mozambique material. Tourmaline is 7 to 7.5 on the Mohs scale, and a dark blue octagon of this size makes a striking ring or signet stone, best set in white metal so the blue stays cool. Tourmaline is the modern October birthstone.
Natural indicolite blue tourmaline, Mozambique, untreated, sold loose.
We ship worldwide from Sofia, Bulgaria. Every order is packed in a protective box with bubble wrap. Orders within Bulgaria are dispatched within 1-2 business days and international orders within 2-3 business days. Free shipping is applied automatically at checkout, and the threshold applies to the order value after any discounts.
Delivery within Bulgaria
- Delivered by Speedy, Econt or Box Now, to a courier office, a locker or your address.
- Fixed prices: Box Now locker €1.60 (free on orders from €25), Speedy office €3.20, Econt office or locker €4.00, Speedy to your address €4.50.
- Free shipping on orders over €50, with any courier and at any weight.
- Cash on delivery is available.
- Delivery normally takes 1-2 business days after dispatch.
- Hardness
- 7-7.5
- Cleavage
- Poor
- Durability
- Fair
- Soapy water
- Safe
- Ultrasonic
- Avoid
- Steam
- Avoid
About tourmaline
Tourmaline is 7 to 7.5 on the Mohs scale with poor cleavage, so it wears well, but many stones contain fine internal fractures. When warmed or rubbed it picks up a static charge, so it attracts dust more than other gems.
Cleaning
Warm water, a drop of mild dish soap and a soft toothbrush are all you need. Brush behind the stone too, where dust and skin oils collect, then rinse and dry with a soft cloth. Skip ultrasonic and steam cleaners: vibration and sudden temperature changes can widen the fine fractures many tourmalines contain, especially pink and red ones.
Wear and storage
Tourmaline is hard enough for everyday wear, but a sharp knock can widen its fine fractures, so take it off for sport or heavy work. Harder stones such as topaz, sapphire, ruby and diamond can scratch it, so store it on its own in a gem jar or a soft pouch.
For your jeweler
This tourmaline is untreated. Tourmaline should be kept away from the torch flame, acid pickle and the ultrasonic bath.
Scale
True to scale: 8 × 5.4 mm
Shown next to a €1 coin (23.25 mm) in the exact ratio, so you can picture the real size.
