Natural Black Tourmaline Stone — 4.83 Carat (5.31 Ratti)
Photos: This SKU has main, back, and in-hand photos — use them to judge colour, polish, and size.
What you are buying: Natural dark tourmaline sold as black tourmaline (schorl type). Weight 4.83 carat (about 5.31 ratti), Oval Mixed Cut. The outline is a bit longer than wide, which many buyers like for finger rings. Ratna Gems lists this as natural tourmaline. 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 — reads black face-up with a possible soft green hint. Photos show this stone. Title stays “black tourmaline” for easy search.
Gem facts: Black jewelry tourmaline is usually iron-rich schorl. GIA gives tourmaline Mohs hardness about 7 to 7.5. Electrical effects when heated or squeezed are scientific facts, not felt in normal wear.
Size: About 12.5 × 8.5 × 5.5 mm. Share with your jeweler for the seat height and basket.
| Detail | Value |
|---|---|
| Weight | 4.83 Carat (5.31 Ratti) |
| Size (L × W × H) | 12.5 × 8.5 × 5.5 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
Strong dark look, works in gold or silver, and suits many ring and pendant designs when the setting protects the stone.
Astrology and belief (read this)
Not a classical Navratna gem and not a classical substitute for Neelam. Often bought for jewelry or personal / Vastu-style belief. We do not promise results. For chart advice, see an astrologer you trust.
Is this stone right for you?
Good if you want a natural black tourmaline near 4.83 carat with a slightly elongated oval. Ask your jeweler for bezel or strong prongs if you wear rings daily.
Simple care
- Warm water, mild soap, soft brush.
- Avoid hard knocks and sudden heat–cold.
- Store away from softer gems.
Browse our Tourmaline Stone range. Read the Black Tourmaline complete guide.
