Next month will greet jewellery collectors and investors with a metaphorical smile after Fellows released its 'Antique & Modern Jewellery' auction catalogue.  It features several unique and valuable trinkets which will tantalise fans of all that glitters.

Top of the lots is a wonderful diamond ring, crafted in 2009.  It holds a 5.68 carat emerald-cut diamond, in a four corner setting.  It sits atop a band of 18 carat white gold, size M ½.

This beautiful piece is tagged with a sizeable estimate reflecting its worth - a considerable £15,000-20,000.  For a serious collector, this ring would make a wonderful investment - as we noted last month, diamonds have soared in value and look set to continue that trend in 2011.

A £8,000 Cartier diamond brooch

With that in mind, collectors should keep an eye on Lot 99 - a gorgeous diamond pendant on a delicate belcher link chain.  The pendant features oval and pear shaped principal diamonds, which have an old European cut.

They are surrounded by clusters of smaller diamonds, which have an approximate total weight of 0.7 carats.  This bright and lively piece has an estimate of £6,000-8,000 - not insignificant, but certainly within the entry-level investor bracket.

Similarly, Lot 540 would be classed in this category, attracting a similar estimate.  The piece is a Cartier diamond brooch, crafted in the early/mid-20^th Century.  This striking spray brooch is shaped like a stylised bow, set with 3.10 carats worth of diamonds.

It is small and delicate, measuring only 4.5cms in length.  Again, diamonds are highly sought after at the moment, and with their increasing rarity, any diamond piece would make a fine investment.  In this case, the Cartier name adds further value - it has an estimate of £6,000-8,000.

The auction features many other rings, brooches and pendants, many set with beautiful diamonds and other precious stones.  Although the top end of the sale may be more expensive, there are plenty of affordable lots.

For new and experienced jewellery collectors alike, the Fellows auction on March 3rd could be a perfect opportunity to pick up a 'gem' of an investment for the long-term.