Gold ::
Gold's purity is measured in karats. 24 karat is pure gold, but its purity means it is more expensive and less durable than gold that is alloyed with other metals. Different alloys are used in jewellry for greater strength, durability and color range.

The karatage of the jewellry will tell you, what percentage of gold it contains: 24 karat is 100 percent, 18 karat is 75 percent, and 14 karat is 58 percent gold. When comparing gold jewelry, the higher the number of karats, the greater the value.

Platinum ::
Platinum, like gold, has a long and distinguished history. Its use began in antiquity and it has undergone resurgence in popularity over the last 200 years. Platinum was held in high esteem during early Egyptian times. Native people in South and Central America discovered its beauty in, as early as 100 B.C.
Platinum in jewellry is actually an alloyed group of six heavy metals, including platinum, palladium, rhodium, ruthenium, iridium and osmium. These other metals are so similar to platinum in weight and chemistry that most were not even distinguished from each other until early in the nineteenth century.

Today, it is often alloyed with copper and titanium. It's the only precious metal used in fine jewelry that is 90% to 95% pure, largely hypoallergenic, and tarnish-resistant. Look for platinum jewelry marked 900Pt, 950 Plat, or Plat.

Silver ::
Silver is one of the first metals to be used by humans. Infact, it may have been the first metal smelted from ore. The art of silver working dates back to the ancient Byzantine, Phoenician and Egyptian empires, where silver was forged into domestic utensils, jewellry, buttons, weapons, horse trappings, boxes, and other articles.