Each of our current metal combinations has a standard ratio of metals for that specific metal combination. If you would like a different ratio (emphasizing one particular metal) we are able to accommodate your request as a custom billet. A custom billet requires an additional charge of $500.00 per order, which helps cover the cost for increased time, labor and materials. A custom billet order may have a longer turn-around time. Rings and jewelry made from a custom billet is non-returnable/non-refundable.