The most popular black gemstones are black diamond, black sapphire, black spinel, black tourmaline (schorl), black onyx, black agate, black garnet, black jade, black opal, obsidian, hematite, black pearl, and jet. Black diamond is the hardest, at 10 on the Mohs scale, followed by black sapphire at 9 and black spinel at about 8.
Black spinel is the gem most often called truly jet-black, since it is naturally black without dye, while onyx, obsidian, and hematite are the most affordable choices. Some "black" stones, like obsidian, jet, and black pearl, are not crystals at all, but volcanic glass or organic materials.
List of Black Gemstones
| Gemstone | Family | Appearance | Mohs Hardness | Rarity and Budget |
|---|---|---|---|---|
| Black Diamond | Diamond | Opaque black, metallic sparkle | 10 | Rare, high (treated and lab-grown versions cost less) |
| Black Sapphire | Corundum | Dark black to blue-black | 9 | Uncommon, medium to high |
| Black Moissanite | Silicon carbide | Deep black with strong sparkle | 9.25 | Lab-created, low to medium |
| Black Spinel | Spinel | Jet black, glossy | 7.5 to 8 | Uncommon, low to medium |
| Black Tourmaline (Schorl) | Tourmaline | Opaque black, often striated | 7 to 7.5 | Common, low |
| Black Garnet (Melanite) | Garnet | Glossy black | 6.5 to 7.5 | Rare, medium to high |
| Black Onyx | Chalcedony | Smooth, even black | 6.5 to 7 | Common, low |
| Black Agate | Chalcedony | Black, sometimes banded | 6.5 to 7 | Common, low |
| Black Jasper | Chalcedony | Black with patterns or veins | 6.5 to 7 | Common, low |
| Black Jade | Jadeite or nephrite | Deep green-black | 6 to 7 | Uncommon, medium |
| Black Opal | Opal | Dark body with colour flashes | 5.5 to 6.5 | Rare, high |
| Obsidian | Volcanic glass | Glassy jet black | 5 to 5.5 | Common, low |
| Hematite | Iron oxide | Steel-gray to black, metallic | 5 to 6.5 | Common, low |
| Black Pearl (Tahitian) | Organic | Dark gray to black, with a lustre | 2.5 to 4.5 | Medium to high |
| Jet | Organic (fossilised wood) | Deep black, very light | 2.5 to 4 | Low to medium |
Precious and Hard Black Gemstones
- Black Diamond: The hardest black gem. It can be natural, treated, or lab-grown, so a lab report matters. The rare "carbonado" form is a porous, black diamond.
- Black Sapphire: A dark corundum that is very durable. Many stones are really dark blue or green and only look black in normal light.
- Black Spinel: A glossy, hard stone that is naturally and evenly black. It has no dye or treatment in most cases, which makes it popular for everyday jewellery.
- Black Moissanite: A lab-created gem with a brilliant sparkle and high hardness. It is not natural, but it is a durable, affordable choice.
Popular Black Gemstones
- Black Tourmaline (Schorl): The most common type of tourmaline, coloured black by iron. It is decent for jewellery, though it can be brittle, so protect the edges.
- Black Onyx: The black variety of chalcedony, and the black stone most people know first. Almost all black onyx on the market is dyed, which is common and accepted when disclosed.
- Black Agate and Black Jasper: Chalcedony stones that are often banded or patterned, and affordable.
- Black Garnet (Melanite): A rare, glossy black garnet that is prized by collectors.
Soft, Organic, and Unusual Black Stones
- Black Opal: A dark opal that shows flashes of colour. It is precious, but softer, so it suits pendants and earrings best.
- Obsidian: A natural volcanic glass formed from quickly cooled lava. It is jet black but soft and brittle, so it needs gentle care.
- Hematite: A heavy, metallic iron-oxide stone with a silvery-black shine, often used as beads and cabochons.
- Black Pearl: A Tahitian cultured pearl with naturally dark nacre, and a soft, delicate surface.
- Black Jade: A deep green-black stone that is tough, though it is rarely seen as faceted gems.
Black Gemstones in Vedic Astrology
In Vedic astrology, black and very dark stones are mostly linked with Saturn and the shadow planets Rahu and Ketu. Sulemani Hakik (black agate) is a popular mild stone for these planets. Black Tourmaline is widely used in crystal healing for protection. For stronger planetary remedies, astrologers usually turn to Blue Sapphire for Saturn, Hessonite for Rahu, and Cat's Eye for Ketu. For astrological use, a natural, certified stone and a chart check come first.
FAQs
1. What are the names of black gemstones?
Common black gemstones include black diamond, black sapphire, black spinel, black tourmaline, black onyx, black agate, black garnet, black jade, black opal, obsidian, hematite, black pearl, and jet.
2. What is the hardest black gemstone?
Black diamond, with a hardness of 10, followed by black moissanite at 9.25, black sapphire at 9, and black spinel at about 8.
3. Which gemstone is naturally black?
Black spinel is the gem most often called naturally jet-black without dye or treatment. Schorl tourmaline, obsidian, and some black diamonds are also naturally black.
4. What is the cheapest black gemstone?
Black onyx, obsidian, hematite, and black tourmaline are the most affordable.
5. Which black gemstone is best for everyday wear?
Black diamond and black sapphire are the toughest, and black spinel is an excellent, more affordable choice.
