VTG Estate Sterling Silver & Large Oval Shaped Amber Brooch Pin! 186 This auction is for a nice preowned estate pin. This is designed out of sterling silver and features a 30mm by 25mm amber center stone. This has a weight of 12 grams. As you can see there is natural patina and this could use a gentle polish. Nice. If you have any questions or concerns before purchasing please message me and I will get back with you asap. Thank you!