I am looking to purchase 8mm white freshwater pearl strands with natural near-round shape. The pearls must meet AA+ quality standards.  
Required specifications:  
- 16-inch strand length  
- Uniform luster and surface cleanliness  
- Minimum 90% roundness  
Please provide available quantities and bulk pricing options.  
No dyed or treated pearls accepted.

I am looking for a supplier of mother-of-pearl tokens at a competitive price. Could you provide a quotation based on the following specifications: Sizes (diameter): 25 mm, 23 mm, 21 mm, 19 mm. Minimum thickness: 3 mm. Colors requested: Natural white, Blue or black. Quantities for quotation: 50 pieces, 100 pieces, 200 pieces. Also inform me of production and delivery lead times, shipping costs, minimum order quantity (if applicable).