I believe it's related to the tribute system that's going in with GoD. It seems to be roughly based on the item's price field.
Note: this shows it as unk106 because that's what it is in my item database... just pretend it's unknown113.
Code:
mysql> select id,name,price,unk106 from items where unk106 > 0 limit 25;
+-------+------------------+--------+--------+
| id | name | price | unk106 |
+-------+------------------+--------+--------+
| 10000 | Lambent Stone | 4500 | 5 |
| 10001 | Pearl Necklace | 5000 | 5 |
| 10002 | Pearl Earring | 1000 | 1 |
| 10003 | Pearl Ring | 2500 | 4 |
| 10008 | Gold Ring | 1200 | 1 |
| 10012 | Black Pearl | 20000 | 20 |
| 10021 | Star Rose Quartz | 1000 | 1 |
| 10022 | Amber | 2500 | 3 |
| 10023 | Jade | 3500 | 4 |
| 10024 | Pearl | 4500 | 5 |
| 10025 | Topaz | 5000 | 5 |
| 10028 | Peridot | 10000 | 10 |
| 10030 | Opal | 17000 | 17 |
| 10031 | Fire Opal | 50000 | 50 |
| 10032 | Star Ruby | 65000 | 65 |
| 10033 | Fire Emerald | 85000 | 85 |
| 10034 | Sapphire | 100000 | 100 |
| 10035 | Ruby | 125000 | 125 |
| 10036 | Black Sapphire | 175000 | 175 |
| 10037 | Diamond | 200000 | 200 |
| 10039 | Bloodstone Ring | 1000 | 1 |
| 10040 | Silver Amulet | 2500 | 3 |
| 10041 | Mithril Earring | 3500 | 5 |
| 10042 | Jade Earring | 4500 | 5 |
| 10043 | Jade Ring | 12500 | 13 |
+-------+------------------+--------+--------+
25 rows in set (0.00 sec)
Grr... why can't [ code ] blocks use courier?