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Gemstones, Minerals & Fossils
Lapidary
Technical Advice for Cutting Stones
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<blockquote data-quote="Dihusky" data-source="post: 434986" data-attributes="member: 10304"><p>Thought I saw the info on dopping positions for a pear somewhere, had a look around our books and it's in John Broadfoot's book, page 199. In his words; "The dop has to be centred at a point that is half the width or the design from the rounded end of the proposed pear shape" I have also seen comments about working a 1/3 - 2/3 ratio for dopping, but I think I'd use Johns guide for my preference.</p><p></p><p>Seem to remember I used the 1/3rds rule when I dopped this citrine, but looking at the result the culet seems to follow the W/2 rule rather well.</p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/10304/1535152160_citrine_pear-1.6ct.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Oops, probably should have cleaned it first :8 Stone finished at 1.6ct so quite small.</p></blockquote><p></p>
[QUOTE="Dihusky, post: 434986, member: 10304"] Thought I saw the info on dopping positions for a pear somewhere, had a look around our books and it's in John Broadfoot's book, page 199. In his words; "The dop has to be centred at a point that is half the width or the design from the rounded end of the proposed pear shape" I have also seen comments about working a 1/3 - 2/3 ratio for dopping, but I think I'd use Johns guide for my preference. Seem to remember I used the 1/3rds rule when I dopped this citrine, but looking at the result the culet seems to follow the W/2 rule rather well. [img]https://www.prospectingaustralia.com/forum/img/member-images/10304/1535152160_citrine_pear-1.6ct.jpg[/img] Oops, probably should have cleaned it first :8 Stone finished at 1.6ct so quite small. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Technical Advice for Cutting Stones
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