- Color: Ruby - Shape: Marquise 3x7mm - Quantity: Pack of 5 Thank you for looking. I purchased these for when I make accessories with silver clay, but I haven't been making them for a while, so I'm selling them. These are synthetic stones that can be fired together with silver clay. Please feel free to ask any questions. I may be slow to reply as I am working. Packaging will be simple. I may use recycled materials for packaging when shipping. Thank you for your understanding. These are unused items, but they have been stored at home, so there may be scratches. I do not smoke, but I do have a cat. Please refrain from purchasing if you are looking for perfection.