Rubies: July’s Birthstone


Thomas Laine Jewelry Blog

Rubies: July’s Birthstone

Rubies and sapphires are two of the most famous and coveted gemstones in the world. But did you know that they are actually different varieties of the same mineral? Both rubies and sapphires belong to the corundum family of minerals. Corundum is composed of aluminum and oxygen and is colorless in its most pure state. But when other trace elements are present, they produce colors. If titanium and iron are present, they create a deep violet blue color and the stone is a blue sapphire. If that element is chromium, it creates a red color and the stone is called a ruby.

Rubies occur in a range of colors, from dark, brownish red to a vivid, bright, true red (often referred to as “pigeon’s blood”) that is the most sought after and valuable. A large number of stones of this excellent quality have historically come from Myanmar’s Mogok mines, but rubies are also mined in large quantities in other locations including Thailand and Sri Lanka.

Its not only the beauty of rubies that makes them ideal for use in jewelry. Both sapphires and rubies are very “hard” gemstones – they are a 9 on the Mohs hardness scale. The Mohs scale measures one gem’s ability to resist being scratched by another. A diamond is the hardest at 10, therefore diamonds can scratch all other gemstones, but rubies come in at a close second. This makes them ideal for daily wear, particularly in rings, because they are less likely to become damaged.

Here is a selection of ruby jewelry available at


70530014 Thomas Laine Elements

Ruby and Black Diamond Earrings


40140006 Sydney Evan

Mini Diamond Hamsa Necklace


70550045 Thomas Laine Confetti

Vermeil Silver Ruby Trio Drop Confetti Earring


70550044 Thomas Laine Confetti

Sterling Silver Ruby Trio Drop Confetti Earring


40020019 Kara Ross

Lollipop Pendant


70530018 Thomas Laine Elements

Ruby and Sapphire Diamond Drop Earrings

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