A blind purchase is a purchase made without adequate knowledge on the product you are buying. This kind of purchase sometimes can be on the both sides, the buyer and the seller.
If you are a customer and you want to buy jewelry from a jewelry store, make sure you have enough knowledge on what you want to buy. If you think you are not sure of what you buy, ask the seller about the gem or jewelry you intend to buy, may be a ring, earrings, necklace etc.
It’s good to have enough information on the product, such as in which occasions the item can be worn. Or what kind of chemicals or solutions were used to process the product, to know how to treat while cleansing it. Is it water only used to wash? or is there any special chemical to wash it or cleanse it.
And if you are a jewelry retailer used this opportunity to explain your products to your customers, such as which ring to put on in which occasion or in daily routine.