This is a Very Rare and Collectable piece of Vintage British Gemstone. Made in Blue John which only comes from Castleton in Derbyshire it is a Heavy Drinks Coaster that is polished on one side and is Matt on the other with a slightly bevelled edge to the Matt side.It weighs 111.7g, measures 63.5mm square and is 8mm thick. It is in a used and As Found condition with just minor surface wear.
Unfortunately one corner is completely broken off, the other three have minor faults within the crystal and there is a tiny chip on one edge. However I don't believe this detracts from such a rare item and with the weight and size it could easily be cut down or be made into Jewellery.
This item is in the category "Antiques\Other Antiques". The seller is "damie1815" and is located in this country: GB. This item can be shipped worldwide.