Diamania provides damonds and you can get  diamond price from here - Diamania鑽戒.

We have numerous styles designed and manufactured in Japan. Pictures shown below are only part of our products for reference.
Price is listed based on 18K gold (including the cost of side stones but not the centre stone).
Most of the styles can be made of platinum, please contact us for corresponding quotation.
Kindly consider our custom-made service if you would love to create your precious and exclusive ring.