1st - Gold 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
Capricorn - Garnet 
Aquarius - Amethyst 
Pisces - Aquamarine 
Aries - Diamond 
Taurus - Emerald 
Gemini - Pearl 
Cancer - Ruby 
Leo - Peridot 
Virgo - Blue Sapphire 
Libra - Opal 
Scorpio - Topaz 
Sagittarius - Tanzanite 
Black Diamond vs Ruby
Which Gemstone Should You Choose?
When choosing between striking gemstones, Black Diamond and Ruby offer completely different aesthetics and appeal. While Black Diamonds represent bold sophistication and modern luxury, Rubies are classic red gemstones associated with passion, prestige, and rarity.
This comprehensive diamond vs ruby comparison will help you understand the differences in sparkle, durability, value, and style, so you can confidently select the perfect gemstone for your jewellery.
Black Diamond vs Ruby: Quick Comparison
| Feature | Black Diamond | Ruby |
|---|---|---|
| Mineral Family | Diamond | Corundum |
| Hardness | 10 – Maximum durability | 9 – Extremely durable |
| Value | Moderate to high; depends on treatment | Very high; investment-grade |
| Best For | Modern jewellery, bold designs, diamond jewellery | Heirloom jewellery, engagement rings, ruby jewellery |
| Professional Guides | Diamond Buyer’s Guide | Ruby Buyer’s Guide |
Black Diamond Features, Sparkle & Modern Appeal Explained
Black Diamond is a unique variety of diamond known for its opaque black colour and bold, contemporary look. Unlike traditional white gemstones, black diamonds absorb light rather than reflect it, giving them a dramatic, metallic-like lustre instead of brilliance.
Origins & Characteristics:
Black diamonds are found in Brazil and Central Africa. Many are treated to enhance their colour and uniformity. Their appeal lies in their modern, edgy aesthetic, making them popular in diamond jewellery such as rings and statement pieces.
Price Guide (per carat):
R8,000 – R60,000 depending on quality and treatment.
Ruby Features, Colour & Prestige Explained
Ruby is one of the most valuable red gemstones, prized for its deep red colour and rarity. With a Mohs hardness of 9, it is highly durable and suitable for everyday jewellery.
Origins & Prestige:
Rubies are sourced from Myanmar, Mozambique, Madagascar, and Thailand. The most valuable stones display a vivid “pigeon blood” red. Rubies have long been associated with wealth, power, and passion, making them highly desirable in fine ruby jewellery.
Price Guide (per carat):
R35,000 – R500,000+ for fine-quality stones.
Black Diamond vs Ruby: Detailed Technical Comparison
| Feature | Black Diamond | Ruby |
|---|---|---|
| Chemical Composition | Carbon (C) | Aluminium oxide (Al2O3) with chromium |
| Colour | Opaque black | Deep red, bright red, “pigeon blood” red |
| Hardness (Mohs) | 10 – Hardest natural gemstone | 9 – Extremely durable |
| Refractive Index | 2.42 | 1.762 – 1.770 |
| Specific Gravity | 3.50 – 3.53 | 3.97 – 4.05 |
| Clarity & Inclusions | Opaque; inclusions give black colour | Silk inclusions common; eye-clean rare |
| Origin | Brazil, Central Africa | Myanmar, Mozambique, Madagascar, Thailand |
| Treatment | Often treated to enhance colour | Heat treatment common |
| Best Use | Modern rings, statement jewellery | Investment jewellery, heirloom pieces |
Black Diamond vs Ruby: Colour, Durability & Care Tips
Sparkle Comparison:
- Black Diamond: Subtle lustre; absorbs light rather than reflecting it.
- Ruby: Vibrant glow with strong colour saturation rather than sparkle.
Colour Comparison:
- Black Diamond: Deep opaque black; bold and modern.
- Ruby: Rich red tones; classic and luxurious among red gemstones.
Durability:
- Black Diamond: Mohs 10 – hardest gemstone, ideal for daily wear.
- Ruby: Mohs 9 – extremely durable and suitable for everyday jewellery.
Black Diamond vs Ruby: How to Tell Them Apart
💡 Tip: Black diamonds are opaque and do not sparkle like traditional white gemstones, while rubies are transparent with a rich red glow.
Black Diamond Summary
- Hardness: Mohs 10 – maximum durability
- Colour: Opaque black
- Refractive Index: 2.42
- Inclusions: Dense inclusions create colour
- Care: Extremely durable; avoid harsh impacts
Ruby Summary
- Hardness: Mohs 9 – extremely durable
- Colour: Deep red, “pigeon blood”
- Refractive Index: 1.762 – 1.770
- Inclusions: Silk common
- Care: Suitable for daily wear; avoid harsh chemicals
Buying Tips
- Choose Black Diamond for bold, modern diamond jewellery designs.
- Choose Ruby for classic, high-value ruby jewellery.
- Always request certification for rubies.
- Check whether black diamonds are treated or natural.
- Consider setting styles; both gemstones benefit from secure, protective settings.
- Browse our Black Diamond Collection and Ruby Collection.
Which Gemstone Should You Choose?
- Black Diamond: Best for modern, bold jewellery with a unique aesthetic.
- Ruby: Ideal for investment, prestige, and timeless elegance.
Both gemstones offer exceptional durability and beauty, but your choice depends on whether you prefer contemporary style or classic luxury.
Black Diamond vs Ruby FAQ’s
Is a black diamond a real diamond?
Yes, black diamonds are natural diamonds, though many are treated to enhance colour.
Which is more valuable, ruby or black diamond?
Ruby is generally more valuable, especially high-quality untreated stones.
Do black diamonds sparkle like white gemstones?
No, black diamonds have a more subtle lustre and do not reflect light like traditional white gemstones.
Can rubies be worn every day?
Yes, with Mohs hardness 9, rubies are highly suitable for daily wear.
Are black diamonds good for engagement rings?
Yes, they are popular for unique, modern engagement ring designs.
Which gemstone is better for investment?
Ruby has stronger long-term investment potential than black diamonds.
COMPARE GEMSTONES WITH CONFIDENCE
Gemstone Comparison Guides
Choosing between two beautiful gemstones can be challenging. Our professional Gemstone Comparison Guides help you clearly understand the differences between popular gemstones so you can make a confident and informed choice.
Each comparison explores the key factors that influence gemstone quality and value, including colour, clarity, durability, rarity and typical treatments. You will also learn how similar-looking gemstones differ in appearance, composition, hardness and more.
HERE IS ALL THE PROFESSIONAL INFORMATION YOU NEED
Gemstone Buyer's Guides
Buying a gemstone should be exciting — but understanding quality, rarity and value is essential before making the right choice. Our professional Gemstone Buyer’s Guides help you understand how colour, clarity, cut and treatments influence the beauty and value of different gemstones.
Each guide explains the key quality factors used by gemologists, including gemstone composition, colour grading, natural inclusions, treatments and origin. You will also learn how these factors affect rarity, durability and market value.
Beryl Family
Feldspar Gemstones
Pyroxene Gemstones
Spodumene Family
Chalcedony & Agate
Quartz Gemstones
Amethyst
Ametrine
Citrine
Prasiolite
Quartz
Rose Quartz
Rutile Quartz
Smoky Quartz
Rare & Collector Gemstones
Apatite
Chrysoberyl
Clinozoisite
Fluorite
Grandidierite
Iolite
Jade
Kyanite
Lapis Lazuli
Phosphosiderite
Prehnite
Serendibite
Sillimanite
Sphene
Sugilite
Vesuvianite