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Some individuals simply choose gem stones that are expensive. Others merely opt for the cheapest gems available. While such a crude way to identify and select precious stones may work for a few people, most seek sufficient knowledge regarding different types of gems before making a purchase. By gaining a practical understanding of how gems are categorized, it would be possible to know which gem would be most suited for a particular occasion. Likewise, knowing how gems are categorized would allow one to find gems that are just right for one's budget. Indeed, those searching for information on gem classification should read on.

Gem stones are mainly classified into three different groups: semi-precious, precious, and rare. Semi-precious gems are usually the most inexpensive of all gems. Quartz, garnet, and citrine are just a few examples of semi-precious gems. It must be pointed out though, that not all semi-precious stones are cheap. Depending upon the quality and weight of a semi-precious gem, it might still amount to hundreds of dollars. Of course, crude semi-precious gems may sometimes be purchased for less than a dollar. Nonetheless, the main advantage of choosing semi-precious gems as a gift is that there is a suitable balance between variety and cost.

Precious gem stones on the other hand, are rather limited in terms of assortment. With only four types of gems classified under such a category, specifically diamond, emerald, sapphire, and ruby, those planning to purchase gems that have uncommon colors and hues may be disappointed. However, individuals aiming to buy gems so as to give the most impactful gifts, would definitely be satisfied in choosing precious stones. As one may expect though, precious gems are indeed valuable, as even pieces that have a low carat weight and minimal dimensions already exceed $150. A one-carat diamond that has no flaws usually amounts to $30,000.

Rare stones, as the name implies, mainly include gems that are difficult to find. With the existence of rare stones such as jadeite, which may cost more than a million dollars, many assume that all gems categorized as rare are much more expensive than precious stones. However, as rare stones such as benitoite and taaffeite are usually priced at around $3,000 to $4,000 for every carat, it cannot be denied that flawless diamonds are still much more expensive. Some may become confused though, as it is usually assumed that a gem's rarity defines its price. While true, one must keep in mind that perfect precious stones are considerably rare as well.

The manner in which gem stones are usually classified is far from perfect. While such categorization may help those who are simply planning to purchase gems as gifts, it is quite likely that individuals aiming to collect gems might be a bit confused as some criteria seem to overlap. Fortunately, highly regarded institutions such as the Gemological Institute of America, often provide alternative classification approaches that would suit those who require an extensive means of distinguishing one gem from another. Regardless of one's aims, learning more about gems is always a worthwhile pursuit.