මැණික් මිළ කරන්නේ මෙහෙමයි - How To Value Gemstones  

Gemstones Of Sri Lanka.
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How To Value Gemstones
Gemstones are minerals, rocks, or organic matters that have been chosen for their beauty, durability, and rarity and then cut or faceted and polished to make jewelry or other human adornments. Even though most gemstones are hard, some are too soft or fragile to be used in jewelry, so they are often exhibited in museums and sought by collectors.
Gemstones Color
Gemstones are diverse in their beauty, and many are available in a stunning variety of shades and colors. Most gemstones have little beauty in the rough state, they may look like ordinary rocks or pebbles, but after a skilled cutting and polishing the full color and luster can be seen. Generally, gemstones with clear, medium-tone, intense, and saturated primary colors are most preferred.
Gemstones Clarity
Gemstones are formed below the Earth's surface and can sometimes show traces of other minerals, called inclusions. Inclusions can look like small spots or imperfections within the stone. When viewed through a microscope or a 10x loupe, they can give information about the geological environment in which the mineral was formed and its origin. Inclusions can sometimes identify gemstones and even prove whether the stone is natural or synthetic. Some gemstones, such as emeralds, are more likely to have inclusions. Others, such as aquamarine and topaz, generally have very few inclusions or even none at all.
Gemstones Cut
The natural beauty of a gem can be enhanced by the way it is cut. There are two basic kinds of gem cuts: cabochon and faceted. The cabochon cut has a smooth rounded top, usually with a flat base, and it is mainly used for opaque or translucent softer gemstones. Cabochons were the only way in which stones were cut until about the 14th century when faceting was developed. Faceting is the process of cutting a gemstone to improve its beauty by making it reflect more light. The faceted cut has many flat cut surfaces (facets) with an overall shape that might be round, oval, square, and more. Only the harder gemstones can be successfully faceted. A gemstone that has been cut and polished is called a gem, or jewel.
Gemstones Carat
The weight of the gemstone is measured in carats (5 carats = 1 gram). It's important to recognize that some gems are denser than others. For example, a one-carat ruby (very dense) is going to be smaller than a one-carat emerald (less dense). Also, different types of gems that are similar in size may still differ significantly in value.
Gemstones Hardness
The hardness of a stone is the only factor in determining gem durability. It indicates the stone’s resistance to scratching and abrasions, or how the surface of the gem will respond to contact with a sharp point. The Mohs Scale rates the hardness of gems and minerals on a relative scale of 1 (softest - Talc) to 10 (hardest - Diamond). Introduced in 1822, the scale originated when Friedrich Mohs chose ten minerals
Precious vs. Semi-Precious Gemstones
One of the major properties of gemstones is whether they are classified as precious or semi-precious. This is a marketing term designed to make specific stones seem more rare or important than others. Precious gemstones have beauty, durability, and rarity, whereas semi-precious gemstones have only one or two of these qualities. Diamonds, emeralds, rubies, and sapphires are all considered to be precious, and thereby, the most valuable and most desirable. All other gemstones are considered semi-precious.
Natural vs. Synthetic Gemstones - gemstones
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