Why Do Emeralds Look Cracked? A Dive into the Fractured Beauty of Emeralds

Imagine opening an exquisite ring box to reveal a glittering emerald stone, only to notice tiny cracks embedded within the verdant depths. You might worry it‘s damaged goods – but in fact, the fractures are a hallmark of real, natural emeralds!

In this in-depth guide, we‘ll unravel the mysteries around why emeralds often form with fractures, how cracks impact their value, and why we shouldn‘t view them as flaws but clues to an emerald‘s wondrous geological origins…

How Do Cracks Get Inside an Emerald? A Look into Their Rocky Beginnings

Emeralds belong to the beryl mineral family which also includes aquamarine, morganite and more. These gems crystallize slowly in magma pockets under extreme heat up to 1600°F and immense pressure up to 4500 kg/cm2 – equivalent to more than 3 million lbs per square inch!

As beryl forms, the intense conditions leave crystals riddled with faults. The elemental turmoil of an emerald‘s birth leaves it prone to internal stresses that cause fracturing. And due to its hexagonal, columnar crystal structure, emeralds have "weak" prism planes vulnerable to cracking. Imagine a towering Roman column – beautiful, but susceptible to toppling with the right force applied.

Another theory suggests that cracks arise during the arduous mining process. Blasting and chiseling emeralds from solid rock can inflict additional damage. Once unearthed, a raw emerald crystal called a "boule" often shows a web of fractures snaking within.

Master gem cutters carefully cleave and facet emeralds to hide or minimize the appearance of cracks. But eliminating them would mean sacrificing substantial weight. According to Gemological Science International, a 1 carat emerald cabochon without fissures would need to weigh over 5 carats rough! Thus for all but the most flawless stones, cracks remain an indelible reminder of an emerald‘s cataclysmic origins.

From Flawless to Fractured – The Clarity Scale for Emeralds

When grading an emerald‘s quality, gemologists use the "Four Cs" – Cut, Color, Clarity and Carat weight. Of these, clarity refers to visible inclusions and fractures. Emeralds are graded on a scale from flawless gems to heavily fractured:

Type 1: No inclusions visible under 10x magnification – the rarest clarity grade

Type 2: Minor inclusions visible under 10x magnification

Type 3A: Obvious inclusions under 10x magnification, but not unaided eye

Type 3B: Obvious inclusions visible to the unaided eye

According to the Gemological Institute of America, over 90% of emeralds fall into the Type 3B heavily included category! Only 10% reach Type 3A, and flawless Type 1 emeralds are exceptionally scarce.

The GIA Clarity Grading System considers fractures a normal feature in emeralds. A stone isn‘t damaged or defective just because it contains cracks. However, more visible fractures do decrease an emerald‘s value compared to cleaner stones.

For example, a 1 carat medium green emerald with eye-clean clarity (Type 3A) might sell for $5,000 per carat. But heavily included (Type 3B), the price could drop under $2,000 per carat. Of course, larger size can offset lower clarity. A 5 carat commercial grade emerald still carries a high price tag.

Filling Fractures: The Controversial Clarity Treatment

Given their prevalence of cracks, the majority of emeralds undergo "clarity enhancement" to improve appearance. This involves filling fractures with oil, resin, or polymers. According to GIA, over 90% of emeralds on the market have been clarity treated.

Filling makes cracks less visible to the naked eye. Under magnification, telltale signs include:

• Unnaturally bright green patches along fractures

• Smooth, glassy planes within cracks

• Bubbles or flow marks in fill material

GIA considers this a permanent treatment since fillers are infused deeply into fractures. Treated emeralds require special care to maintain stability. Re-oiling may eventually be needed if fillers dry out or dislodge.

Opinions differ on fracture filling. Supporters view it as a means to enhance emerald beauty and durability. Purists see it as deceptive, preferring the unaltered integrity of a natural stone. Both points have validity. The key is full disclosure so consumers understand what they‘re purchasing.

Caring for Emeralds: Protecting Their Delicate Nature

While spellbinding, emerald‘s beryllium aluminium silicate composition makes it one of the softer gemstones, rating 7.5-8 on the Mohs scale. Combined with fractures, this softness means emeralds are fragile and require gentle care.

The Gemological Institute of America suggests these tips for protecting your emerald jewelry:

• Remove emerald pieces before strenuous activity where bumps or blows can occur.

• Avoid contact with hard surfaces that could cause abrasion or fractures.

• Don‘t expose emeralds to hot water, steam, or harsh chemicals that can damage fracture fillers.

• Have emeralds professionally cleaned only when needed. Avoid at-home ultrasonic or steam cleaners.

• Store emerald jewelry individually in soft fabric or papers, not touching other gems where rubbing can occur.

With common sense care, emerald jewelry can be cherished and handed down for generations. The fractures may be visible evidence of the journey your emerald has been on, but with proper precautions, its adventures have just begun!

Celebrating Legendary Emeralds: Stories in the Stones

Some of the most famed emeralds bear unique fracture patterns and inclusions that tell the tale of their formation. Like mapping a river‘s winding route from space, we can marvel at hints of the geologic forces that shaped them.

A few legendary emeralds:

• The Patricia Emerald – At 632 carats, one of the largest gem-quality crystals, with enigmatic natural markings that have puzzled gemologists for decades. Now housed at the American Museum of Natural History.

• The Chalk Emerald – A 37.82 carat Colombian emerald in the Smithsonian Museum that contains a rare three-phase inclusion with solid, liquid and gas components.

• The Mackay Emerald Necklace – This historic Cartier art deco necklace features a 167 carat emerald carved from a single crystal, with signature veining visible reminiscent of a lush tropical jungle.

While the most elite emerald collections pursue perfection, many jewelers have come to embrace the markings that make each emerald distinctive. Award-winning designer Loretta Castoro describes emeralds as "Art Deco paintings" with their fractured layers telling a mesmerizing story.

So next time you observe cracks in an emerald, view them not as flaws but as windows into the incredible journey that formed this rare crystal over millions of years. They make each emerald beautifully unique – truly a natural work of art!