The rare dark red English multi, when held up to the light has black veins inside, was found and supplied by.... http://seawitchseaglass.co.uk/# and is no back bezel set. The pendant is made of 18 gauge square sterling wire. It measures 2 x 2 3/4 inches. The chain is handmade of 20 gauge square sterling wire except for the sterling silver lobster clasp. The necklace is 18 1/2 inches in length, but can be made any length desired.