I have carefully cut a piece of copper foil, embossed it with a dot pattern and fused it between glass in my garden workshop kiln. Each heart measures approximately 3cm x 3cm and is presented on a printed card. It is attached with a glue dot so can easily be removed to put in a purse or pocket. Great for a small token of affection or a stocking filler.
If you wish to post it, the card will need extra wrapping to protect the glass or I will be happy to post it straight to the recipient with your message. Not suitable for young children.