Blue and White Diamond Heart Pendant-Necklace in Sterling Silver Sterling Silver Heart with Blue and White Diamonds Heart measures just under 2/3 of an inch. Blue diamonds are heat treated blue, white diamonds are not treated. .925 sterling silver- Rhodium Finished Sterling Silver Heart with Blue and White Diamonds Heart measures just under 2/3 of an inch. Blue diamonds are heat treated blue, white diamonds are not treated. .925 sterling silver- Rhodium Finished