Spinel vs. Ruby: What’s the Difference?

Ruby and spinel are both stunning red gemstones, often mistaken for one another due to their similar color and brilliance. However, they are distinct in their composition, rarity, and value. If you're considering investing in a red gemstone, here’s how spinel and ruby compare.

1. Composition & Structure

• Ruby is a variety of the mineral corundum, composed primarily of aluminum oxide with trace amounts of chromium giving it its rich red color.
• Spinel is a different mineral altogether, composed of magnesium aluminum oxide. Unlike rubies, spinels do not require enhancement or treatments to achieve their color.

2. Color & Appearance

• Ruby comes in shades ranging from pinkish-red to deep blood red, with the finest rubies displaying a rich “pigeon blood” hue.
• Spinel naturally occurs in a variety of reds, from bright crimson to deep burgundy, often resembling high-quality rubies. However, spinels have a slightly softer glow compared to the intense fire of a ruby.

3. Hardness & Durability

• Ruby ranks 9 on the Mohs hardness scale, making it one of the hardest natural gemstones, ideal for daily wear in jewelry.
• Spinel is slightly softer, ranking 7.5 to 8, but is still highly durable for rings, necklaces, and earrings.

4. Rarity & Value

• Ruby is one of the most sought-after and expensive gemstones, especially those from Burma (Myanmar). High-quality rubies are rare and command premium prices.
• Spinel is also rare, but it has historically been overlooked, making it a more affordable yet equally stunning alternative to ruby. Some rare spinels, like vivid red or pink varieties, are increasing in value.

5. Treatments & Enhancements

• Ruby is often heat-treated to enhance its color and clarity. Some rubies are even treated with lead glass filling to improve their appearance, which can affect their long-term durability.
• Spinel is almost always untreated, making it a more natural choice for collectors who prefer gems in their purest form.

6. Historical Significance

• Many famous rubies in history, including those in royal collections, were later discovered to be red spinels. The "Black Prince’s Ruby" in the British Crown Jewels is actually a spinel, proving how similar they look!

Which One Should You Choose?

If you’re looking for a prestigious, investment-grade gemstone with strong historical significance, ruby is the way to go. However, if you want a beautiful, rare, and more affordable alternative, spinel is an excellent choice with natural, untreated brilliance.

At MrSpinel, we specialize in ethically sourced, high-quality spinels that rival the beauty of rubies. Explore our collection today and discover the perfect gemstone for you!