American Gem Society
Stanford Shopping Center, Palo Alto   •   650 325–3533 SHOP   •   CART
Gold Jewelry Palo Alto


The jeweler allows me to wear the sapphire blue lake on my finger, emerald green leaves around my neck, and take the citrine sunset with me wherever I go. Jewelry has become my daytime link to nature in an office with no windows. And if I have to work late, there's nothing like diamond stars and a pearl full moon against an onyx night sky.” This wonderful quotation, by Astrid Alauda, perfectly expresses the emotional connection that has been provided by colored gemstones for thousands of years.

Fine colored gemstones have been revered throughout history. Gemstones have been imbued with the power to foretell events, strengthen memory, quicken intelligence, ensure purity, avert lightning, prevent intoxication, ensure happiness and are often equated to the fountain of youth.

Gleim's Colored Gems

We shop the world for the finest, most exotic gemstones, from natural emeralds and rubies to rare alexandrites. In addition, we make sure that our customers are fully informed of any gemstone enhancements known for the particular gem they are considering.

What Defines a Colored Gemstone?

Colored gemstones are described as all the various gemstones except for diamonds. Only a select few of the vast number of minerals known qualify as gemstones. In order to become a gemstone, the mineral must be rare and beautiful, and be durable enough to be worn as jewelry.

Precious vs. Semi-Precious Gems?

In the past, the term "precious" was used to describe diamond, emerald, ruby, and sapphire. The term "semi-precious" referred to all other gemstones. Today, most jewelers and gemologists agree that these terms no longer accurately reflect the true value of these gems. In particular, some species of colored gems, such as alexandrite or demantoid garnet, are so rare that they have been known to command prices exceeding those of emerald, ruby, and even diamonds.

Is There a Standardized and Widely Used Grading System for Colored Gemstones Similar to the G.I.A. Diamond Grading system?

Currently, there is no widely used grading system for colored gemstones. There have been many attempts over the years to establish such a grading system but none has succeeded, primarily because colored gemstones have such wide variations in color, clarity, and cutting. As an example, the emerald variety of the beryl mineral tends to be highly included while the aquamarine variety of the same mineral exhibits very few inclusions, but emerald is normally more expensive than aquamarine.

Gemstones generally can be grouped into three major clarity categories:

1. Gems that are flawless or have very minor inclusions e.g. aquamarines and amethysts.

2. Gems that are moderately included e.g. rubies and sapphires.

3. Gems that tend to be highly included e.g. emeralds and red tourmalines.

Color is the single most important deciding factor in determining the value of a gemstone, followed by the cut. The cut of a gemstone is designed to bring out the best possible color or colors in the rough uncut material while retaining as much weight as possible. The color in a fine gem is saturated evenly throughout the stone and is of a brilliant deep, rich, and pleasing color, not too dark and not too light.

Each variety of colored gemstone has a range of highly prized colors that have evolved over the years. Many of these colors are tied to historical sources such as "Burmese" rubies from Burma, "Kashmir" sapphires from India, and "Persian" turquoise. This is by no means a sure bet. Not all rubies from Burma have the “Burmese” signature color and furthermore, you may find a fine color from a ruby that was mined in Thailand.

Ultimately the wearer decides what color speaks to them, keeping in mind that this may not be that color defined as being the most valuable. Since we all perceive color differently it’s ultimately a very personal choice.

Today, with the ever-increasing advances in gemstone enhancements and synthetic gemstone production, it is more important than ever to work with a reputable and properly trained jeweler. We have been serving the Peninsula since 1931. We have been members of the American Gem Society since 1954, which assures you that we earn and maintain the education necessary to provide you with the most up to date information about gems and their different markets. We have American Gem Society Accredited Gem Laboratories, assuring you that we have the proper instruments to identify and grade gems. And, what’s perhaps most important, we love colored gems!

Goshwara Jewelry

Goshwara Mixed Gem Jewelry