While big, bold, and beautiful, these coins are somewhat modern without a strong collector following. In the Standard Catalog of World Coin they are listed as 'gold bullion coinage.'
In circulated condition, they carry pretty much bullion value. Small collector premiums can be added for uncirculated coins (see below).
All coins are dated 1923. The number below the date is the number of years since 1923 that the coin is dated. Alexandra's coins, with a 23 below the 1923, is dated 1946.
25 KURUS: 15 mm diameter, 0.0532 troy ounces gold
50 KURUS: 17 mm, 0.1064 ounces gold
100 KURUS: 22 mm, 0.2127 ounces
250 KURUS: 26 mm, 0.5318 ounces
500 KURUS: 34 mm, 1.064 ounces
Using a site like kitco.com, we can calculate the gold value of these coins. At approximately $1180 US dollars per troy ounce at the time of this writing, each 500 kurus coin has a precious metal value of $1180 x 1.0637 = $1255. Not too shabby!
Remember to look up the current gold value using the link provided above - it changes from day to day.
You can add small collector premiums to coins that are perfectly, absolutely uncirculated. Unless your coin has been in a protective holder since it left the mint, it is not uncirculated.
FULLY UNCIRCULATED COINS
25 kurus: add $5 premium
50 kurus: add $20
100 kurus: add $50
250 kurus: add $100
500 kurus: add $200
A dealer would charge a fee to buy the coin from you as gold bullion. This is necessary to keep his or her business afloat.
A scratched, cleaned or holed coin will only be worth the gold content, even if it is fully uncirculated.