Platinum is growing in popularity in the jewellery industry. It is an exceptionally durable metal and its white lustre enhances the fire and brilliance of white diamonds much better than yellow gold. It is heavier than gold and this, combined with its more expensive market price (almost twice the price than gold, per ounce) makes it significantly more expensive than an equivalent gold piece of jewellery.
Platinum used in the manufacturing jewellery industry is alloyed with other heavy metals, palladium, rhodium, ruthenium, iridium and osmium. Today, platinum may also be alloyed with copper and titanium. It is the only precious metal used today in jewellery manufacturing that is 90% to 95% pure, largely hypoallergenic, and tarnish-resistant. Platinum purity is expressed as a factor of parts per thousand, where 95% pure platinum is marked as 950Pt. This refers to 950 parts platinum and 50 parts alloy metals. 900Pt contains 900 parts platinum and 100 parts alloy, and so forth.