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Natural Black Star Sapphire 1.40ct 8.4x6.5mm 6-Ray Oval Cabochon Untreated
€18.00 EURSKU: st192
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A natural black star sapphire oval cabochon with a blazing 6-ray star visible across the full width of the dome under direct light. The stone reveals warm golden-brown undertones through its dark body, with the silky rutile needles responsible for the asterism clearly traceable as fine parallel bands. Two natural fracture lines add to the stone's honest character and confirm its completely untreated origin.
Sourced from Thailand and left unheated, this oval cabochon presents the authentic optical qualities of a natural star sapphire. The elongated outline suits east-west ring settings, oval bezels, and statement pendants where the star can track a moving light source dramatically.
Natural black star sapphire, September birthstone - sold loose, single stone.
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
- 9
- Cleavage
- None
- Durability
- Very good
- Soapy water
- Safe
- Ultrasonic
- Avoid
- Steam
- Avoid
About sapphire
Sapphire is corundum in every color except red. At 9 on the Mohs scale it is second only to diamond, and it is also very tough with no cleavage, so it rarely chips or splits when knocked. Together that makes it one of the most durable gemstones for everyday wear, rings included.
Cleaning
Warm water, a drop of mild dish soap and a soft brush, then rinse and dry with a soft cloth. Skip ultrasonic and steam cleaners: cabochons usually contain fine inclusions or fissures that vibration and heat can open.
Wear and storage
The star comes from fine needle-like inclusions inside the stone. They make it slightly less tough than a clean faceted stone, so treat the domed surface gently. Sapphire is very hard, so it can scratch softer gemstones stored with it. Only diamond can scratch it, so keep it apart from diamonds and store it on its own in a gem jar or a soft pouch.
For your jeweler
This sapphire is untreated. Sapphire handles normal setting, re-tipping and polishing well. If the stone has fissures that reach the surface, keep it out of direct torch flame and acid pickle.
Scale
True to scale: 8.4 × 6.5 mm
Shown next to a €1 coin (23.25 mm) in the exact ratio, so you can picture the real size.
