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.
