Gemological Institute of America). There are 10 round brilliant cut diamonds set down into the band and these measure approximately 2.5mm each and weigh approximately 0.50 carats or half a carat in total. They are also E/F in colour and SI in clarity. Our engagement and wedding rings are made to order. Contact us for more information on the 4 C's of diamonds: Diamond Colour, Diamond Cut, Diamond Carat Weight and Diamond Clarity.