Japan will issue commemorative gold and copper coins next year to celebrate Emperor Akihito's 30th year on the throne, the Finance Ministry said Tuesday.

The coins, legal tender worth 10,000 yen ($90) and 500 yen, will be available from around February in the run-up to the 84-year-old emperor's abdication scheduled at the end of April.

Intended as a collector's item, the 10,000 yen coin will be made of 20 grams of solid gold and priced at 138,000 yen, reflecting the over 10,000 yen in manufacturing cost.

The ministry will issue 50,000 of the gold coins, which will depict a phoenix on one side and the imperial chrysanthemum seal on the other. Reservations can be made from Nov. 1.

As for the 500 yen copper coin, 5 million will be issued. It will feature a rare two-tone construction and depict the carriage the emperor used for his wedding to Empress Michiko in 1959.