From "The Daily Mail"...May 8 2018

Despite their solid exterior, diamonds aren't invincible, according to one jeweller who has seen countless gems ruined from age, improper cleaning technique and carelessness. 
Mike Marty, the director of Seattle-based online diamond and fine jewelry retailer Blue Nile, explained that, contrary to popular belief, diamonds are not invincible; he noted that while they may be one of the hardest substances on earth, they 'remain prone to damage when exposed to extreme pressure or force'. 
So to help those suffering from destroyed diamonds, Mike provided some much needed dos and don'ts to keep them sparkling forever. 

DO be wary about beauty products

The first thing Mike says to do is be wary about the beauty products such as hand creams and lotions you are using. 
'Lotions, cosmetics, and perfumes may be beautiful but their effect on jewellery is another story,' he says. 
'Products can build up over time and cause your jewellery to lose its natural shine while harsh chemicals may weaken or discolour your precious metals. We recommend you remove your jewellery before applying your product.'  

 DO remove your jewellery before any manual labor

The second thing Mike said to do is remove your jewellery before engaging in strenuous activities - a simple solution but one a lot of people surprisingly don't do. 
He says: 'Damage to your diamonds is avoidable. Simply remove your jewellery before engaging in activities that might damage the stones. 
'For example, gardening, cleaning, and even exercise can put your precious gems at risk.' 

 DO regularly inspect your diamonds for damage

Another piece of advice Mike gives is to inspect the jewellery - whether a ring, earrings or necklace - for damage. 
He notes it doesn't have to be frequent as a lot of people don't wear excessive jewellery everyday but he does suggest taking the time to make sure everything is looking copacetic with your gems.  
'The more you wear your jewellery, the more often it should be inspected,' he says. 
'If you only wear the item once or twice a year, a simple eye-check before placing the item back into storage is acceptable.'

DON'T neglect your diamonds

The worse thing anyone can do to their diamonds is neglect them because not only does it make the precious gems' condition worsen but it leaves you with an expensive item can't be worn. 
So, to make sure this doesn't happen Mike said to not neglect your diamonds and make sure they are protected.   
He says: 'To protect your valuables, we recommend that all jewelry, in particular rings, which tend to receive a significant amount of wear, are inspected every six months, and no less than once every 12 months.' 

 DON'T forget to clean your jewellery
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The last thing Mike said not to do was let oil and dust build up in the diamonds because that may be dulling the 'beautiful sparkle'. 
'Remove any oil and dust that has collected in the crevices behind your setting that may be dulling the beautiful sparkle,' he says. 
'Simple steps can keep your stone sparkling for a lifetime.'
He also adds that even though diamonds are tough, they still need care and attention.  
'While durable, diamonds still need care,' he says. 
'We recommend cleaning and inspecting your jewellery often. Check your jewellery settings frequently to be sure that prongs aren't working loose.'