Natural Black Tourmaline Stone 3.68 Carat (4.04 Ratti)

Natural Black Tourmaline Stone — 3.68 Carat (4.04 Ratti)

Photos: Use main, back, in-hand, and side views — the side shot shows the 4 mm height well.

What you are buying: A compact natural black tourmaline: 3.68 carat (about 4.04 ratti), Oval Mixed Cut. The 4 mm depth is lower than the others in this batch — often easier for a comfortable, low ring. Ratna Gems lists this as natural tourmaline (schorl type). If testing paperwork is included with your shipment, read it for that provider’s conclusions.

Documentation: If a gem testing report is included with your order, it is the official source from that laboratory only. We do not reproduce your specific document here.

Colour: Ratna Gems specification: greenish black. Photos show this stone. Title stays “black tourmaline” for buyers searching that name.

Gem facts: Typically schorl. GIA: hardness about 7–7.5 Mohs — OK for jewelry if you avoid hard bumps.

Size: About 12 × 8 × 4 mm. Good numbers for a jeweler planning a slim band or small pendant cup.

Detail	Value
Weight	3.68 Carat (4.04 Ratti)
Size (L × W × H)	12 × 8 × 4 mm
Colour (Ratna Gems specification)	Greenish Black
Shape / cut	Oval Mixed Cut
Transparency	Opaque (light does not pass through this stone)
Luster	Vitreous (glass-like shine, typical for natural tourmaline)
Chemical composition	Iron-rich tourmaline (schorl type) — complex boron aluminium silicate. Reference formula: NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
Stone type / variety	Natural Tourmaline — black tourmaline (schorl)
Hardness	7.0 to 7.5 on Mohs scale (see GIA tourmaline overview)
Specific gravity (typical range, schorl)	About 3.06 to 3.25
R.I. (reference range)	1.61 to 1.65 — typical range for this material; confirm against any documentation supplied with your order.
Treatment	Un-Heated & Un-Treated
Indian / trade name	Vikrant Mani
Material (Ratna Gems listing)	Natural tourmaline (black tourmaline / schorl) — how we describe and sell this stone. Verify on any authentication paperwork included with your purchase.

Why people buy black tourmaline

Dark natural gem that fits gold or silver without a huge height on the hand when cut flat like this.

Astrology and belief (read this)

Not Navratna, not a classical Neelam replacement. For jewelry or personal belief only — no guaranteed effects. See an astrologer for chart questions.

Is this stone right for you?

Best if you want a smaller, low-profile natural black tourmaline (~3.68 ct) for a delicate ring or small pendant.

Simple care

• Warm water, mild soap, soft brush.
• Avoid hard hits; low profile helps but stone can still chip.
• Keep separate from softer gems.

More tourmaline: Tourmaline Stone. Guide: Black Tourmaline complete guide.