CARAT - It has a phone customer service department to answer your queries. As far as the exchange is concerned, you have only 7 days to think and decide if you want an exchange or not. On the top of it, it will deduct a 10% restocking fee incase you want an exchange to take place.

Russian Brilliants - It has a phone customer service department to take care of the after-sales queries of the customers and it also allows you an exchange within 7 days.

Diamond Nexus Labs - It is the most liberal of them all. No fuss about processing your exchange which is free of charge. No hassle or re-stocking fee. What is more is it allows you a 30-day period to think and decide if you want to exchange it or not.

Ring Resizing:

Resizing might occur because of the weight loss or gain or even due to an error in size selection. Each of the companies that manufactures synthetic diamond ring (joias) has different policy regarding resizing the ring. Russian Brilliants does it for a small fee whereas CARAT has no clear resizing policy. Diamond Nexus resize your ring within 30 days of the purchase and free of charge. ASHA recommends its customers to resize their ring (joias) by any local dealer and if this is not possible then it will do it for you; however, it will charge $35 to size white gold and $55 for platinum.

Lifetime Warranty:

Customer service policies by different companies vary from each other and so does the lifetime warranty. Russian Brilliants and CARAT offer a lifetime warranty on their lab-created diamond products (joias) against color changes. ASHA has repelled its lifetime warranty offer of late claiming that some customers were trying to return products even though the damage had taken place due to customers` or jewelers` negligence. Diamond Nexus guarantees a free replacement in the event of any fade, discolor, damage of Diamond Nexus Labs gemstone. Moreover, it also ensures a free replacement if the stone (joias) is ever lost from its setting.

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