Forged in the Earth to Delight People Forever… April’s Birthstone, the Diamond

“A kiss on the hand may be quite continental, but diamonds are a girl’s best friend.”


Born in April? Lucky, lucky you. You will have a lifelong excuse—as if you need one—to treat yourself to what is still the most popular and valuable gemstone on earth: the dazzling diamond.


Is there any stone more beloved and desired than the diamond, April's birthstone? Considering its rarity and value, it’s a tribute to the diamond’s appeal that so many women today own at least one, and many men do too.


The diamond is remarkably simple in its composition, yet stunning in its unique ability to reflect and refract light into vivid flashes of brilliant color, for which humans have always revered it. The ancient Hindus called the diamond “vajra,” meaning lightning, because of the sparks of light it throws off, as well as its invincible strength. The diamond is harder than any other substance on earth—four times harder than the next hardest natural mineral, corundum (sapphire and ruby). In 16th-century England, uncut diamond crystals were set into “scribbling rings,” the exposed points used by lovers to etch romantic messages into windowpanes. Diamonds have been used as cutting and engraving tools since early times, for carving cameos from stone, cutting jade, and drilling pearls.

The diamond’s value is not arrived at arbitrarily. It has many qualities that make it the most expensive and prized gemstone on earth. If you are a fan of superlatives, this list is for you:

Pear cut

• As mentioned above, a diamond is the hardest substance on earth by a wide margin. Nothing can scratch a diamond other than another diamond. And a diamond can scratch anything, even a sapphire.


• Pure diamond is completely colorless and transparent over a larger range of wavelengths (from the ultraviolet into the far infrared) than any other solid or liquid substance. Nothing else even comes close.


• Diamond conducts heat better than anything—five times better than the second best element, silver. (This is the basis for testing diamonds, as it’s easy to do and can’t be faked.)


• Diamond has a high index of refraction (ability to bend light), which gives it the high luster called adamantine. Diamond also has a relatively high optical dispersion, which gives it the flash of “fire” that makes it so desirable.


Diamonds have been revered throughout history, embellishing the items of royalty like crowns, swords, and emblems, as well as jewelry. Diamonds have also been credited for having certain medicinal properties. During the middle ages, they were thought to heal illness, but only if the ailing person took the diamond into bed to warm it up first. 


Historically, only the elite could own diamonds. In the 13th century, Louis IX of France even passed a law reserving diamonds only for kings. But as more sophisticated methods of diamond mining and exporting evolved, diamonds became more plentiful and accessible to others. 

A diamond before cutting

Formed deep within the earth where there is intense heat and pressure, diamonds are simply crystallized carbon. Volcanic activity brings the gemstones to the earth’s surface, where they are found either in volcanic rock formations or washed out into rivers. India is the first riverbed source of diamond mining, but today diamonds are found primarily in Australia, the Soviet Union, and Africa.



Believe it or not, an uncut diamond often looks like nothing more than a plain pebble upon the beach. The stones’ true beauty was not revealed until gemstone cutting and polishing techniques were perfected in the 16th century. Today, the value and appeal of a diamond depends largely upon how skillfully it is cut and faceted. Diamonds may be nearly any color in the rainbow plus browns, grays, and white. Shades of yellow are most common, followed by colorless. Blue, black, reddish, and greenish are more rare, and more valuable.

Princess or round cut

The ancient Greeks believed that the fire of a diamond reflected the flame of everlasting love. In 1477, Archduke Maximilian of Austria presented his fiancée, Mary of Burgundy, with a diamond ring, this beginning the tradition in the West of presenting the diamond as a promise of marriage and a symbol of everlasting love, now adopted the world over. It’s believed the origin of wearing the engagement ring on the third finger of the left hand is rooted in the ancient Egyptian belief that the “vena amoris,” or vein of love, runs from the heart to the top of this finger. 

From the stunning displays of designer stones flashed by movie stars on the red carpet to the modest engagement rings of young brides, diamonds continue to enjoy great popularity people from all walks of life. As actress Zsa Zsa Gabor said, summing up this universal love of diamonds: “I have never hated a man enough to give his diamonds back.”


“Men grow cold as girls grow old, and we all lose our charms in the end. But square-cut or pear-shaped, these rocks don't lose their shape—diamonds are a girl's best friend.”
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Carrying on the great tradition of diamond jewelry, RGC specializes in creating the most unique and perfect expression of your love and commitment in engagement rings and bridal sets. For all the information you need about buying diamonds, such as an explanation of the Four Cs, please visit our website.