longwin large 120mm (4.7 in) crystal diamond polyhedron paperweight wedding venue decoration centerpieces with glass base longwin <br>material:k9 crystal, which is one of the highest quality and most durable optical glass – crystals on the market and is prized for not only its clarity but its durability in addition to being affordable. k9 crystal is the choice of crystal used to make prisms for lasers! k9 has the same physical properties as 24% leaded crystal as it polishes, shines as well as sparkles the same as 24% leaded glass (crystal), but doesn’t have the lead, it is lighter than leaded glass and more durable. <br>these gems are machine polished, this technology make the gems shaped well and more glittering and eye-catching. it can be used as wedding, party, home, office decoration and any festival gift.