All that glitters is gold and jewellery. In 2014, one blue diamond sold for 24 million US dollars, and smart devices proved they could be clever and stunning works of beauty. Increasingly, jewellery is no longer just about bling. The most talked about ones, look more than just pretty.

On display at the International Consumer Electronics Show in January was the Zazzie.

Connected to an app on a smartphone or tablet, it is attached to a ring, necklace or bracelet and can be set to vibrate and flash a pre-programmed image to alert the wearer that they're receiving a call, text or email.

And since the accompanying jewellery is modular, the same Zazzie can be worn with different pieces.

Modular jewellery took centre stage at this year's INHORGENTA trade fair in Munich.

Adding charms to customise the look? Thats passe. The trend this year is jewellery that is fully transformable.

This ring by Jorg Heinz can switch from a white gold to a diamond face with a simple quick click and a twist.

The pendant of this necklace - also by Jorg Heinz - can be turned to reveal different looks.

The star of the Jorg Heinz collection was this 45-thousand euro necklace that comes with a pendant that can be turned to reveal a heart shaped ruby stone.

Even wedding rings went modular this year.

The ring for women which comes in a matching set by German jeweller, Gerstner can be bought for the wedding and then memoir rings can be added later to mark, for example, an anniversary or birth of a child.

But diamonds will always be a girl's best friend - and this year they simply had to be blue.

This is "The Blue" - thought to be the largest and most vivid blue diamond in the world.

It was auctioned by Christie's in May and fetched a cool £14 million pounds (USD $24 million).

"It is the largest vivid blue diamond to ever have appeared on the auction market. Over the last 30, 35 years, only 5 vivid blue diamonds over 10 carats have appeared at auction. So this weighing 13.22 carats is an exceptional stone," said David Warren, Int'l director of Christie's Jewellery Dept.

This architectural design was a highlight at this year's India International Jewellery Show in Mumbai.

This Taj Mahal' necklace was created by Indian jewellery brand, Kotia Jewels.

Using gold and mother or pearl to give the look of the marble that's used for the real Taj Mahal, it's priced at USD $25,000 and took about 3 months to make.

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