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Message:: [QUOTE="Hollyblue, post: 441419, member: 1496"]There were checkerboard cut types in the 1930's I believe.Lapidary Journal and other magazine were publishing designs in the 60's,then the Windows 3.1 program and GEMCAD for Windows95 and it is still used today.But without a specific design name for the stone it would probably be impossible to date just the stone and not one which was cut 40 years after the design was published. <a href="https://www.google.com/search?q=checkerboard+facet+diagram&client=firefox-b-1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiCnKfFpbHfAhWQxIMKHZduBZQQ_AUIDigB&biw=1541&bih=872#imgrc=_" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.com/search?q=checkerboard+facet+diagram&client=firefox-b-1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiCnKfFpbHfAhWQxIMKHZduBZQQ_AUIDigB&biw=1541&bih=872#imgrc=_" rel="nofollow">https://www.google.com/search?q=checkerboard+facet+diagram&client=firefox-b-1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiCnKfFpbHfAhWQxIMKHZduBZQQ_AUIDigB&biw=1541&bih=872#imgrc=_</a>[/QUOTE]