The Harmony ring is made of rhodium - the world's most expensive metal --and encrusted with diamonds. It is being hastily made by Italian designer Giovanni Bosco in time for January's inauguration ceremony.

Only about 25 tons of rhodium are mined each year, mostly in South Africa, and as a result its price is typically around £5,000 an ounce.


Diamond encrusted thanks: Barack Obama will buy his wife this £20,000 ring made of black gold or rhodium

The stunning thank you ring is made by top Italian designer Giovanni Bosco, who are based at Valenza Po near Alessandria and who counts a select list of VIPS's and celebrities as his clients.

Rhodium is one of the world's most precious metals and as a result only about 25 tons are mined each year and as a result it's price is higher than gold - typically being around £5000 an ounce