Loose stones. Synthetic cubic zirconia Synthetic diamond Natural quartz Natural diamond Natural zirconia etc. About 1 in 30 are natural diamonds. It's rare. Checking each diamond is difficult. Also, the checker is not perfect, so I will list them as is. Shipping takes about a week. Please refrain from purchasing if you are in a hurry. For repeat customers: 300 yen off all items. After the price reduction, please understand if someone else buys it. Checking the size is important. Please be sure to count the scale. All items will be shipped via Nekopos (Japanese postal service). They will be delivered to your mailbox. Please check the reviews. You will understand the characteristics. Counting the scale is the key to a good purchase.