Taking Critical Measurements:
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- Rosa Norman
- 8 years ago
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1 : Unfortunately today, the vast majority of appraisals seriously lack vital and critical measurements. It is caused by a combination of not knowing any better and out-and-out sheer laziness. Once again Professionalism must rise above it all and appraisers need to accept their professional responsibilities and do the very best job they can. That is why you are getting paid to do what you do. A professional job equals a professional fee for professional services rendered. is actually very easy to perform and it only takes a few moments to do those tasks. First off, we first need to look at the tools and equipment required and/or needed to perform the simple yet precision oriented task required of us as professional appraisers and that is to quickly yet accurately measure the items(s) we are being paid to appraise in a professional manner. Tools needed and/or required: Ring Mandrel, Vernier Slide Gauge, Digital/Dial Calipers, Digital/Dial Leverage Style Gauge with high setting attachment, Table Gauge Transparency, Various Diamond Shape & Size Transparencies, and Calibration Blocks. Ring Mandrels: Ring Mandrels can be made from a variety of materials, solid metal, hollow metal or injected plastic. The most important aspect is that you first need to measure each of the ring size markings and record those measurements and then check those measurements against published and accepted ring size measurements to assure accuracy and repeatability. Page 1 of 17
2 ***Important Safety Reminder*** Double check to make sure the culet of the stone DOES NOT protrude past the bottom of the inside of the ring shank before you slide the ring down the ring mandrel or you might end up chipping or breaking the culet or pavilion of the stone. Another important aspect is that when you slide the ring down onto the ring mandrel you need to visually check that the entire inside of the ring s surface is in direct contact with the ring mandrel because a lot of the times the ring may be out of round due to wear or from sizing a ring beyond its accepted capabilities. Some rings have to be sized oval or egg-shaped due to stone setting issues. Double check to make sure the inside of the ring s surface is in contact with the ring mandrel. If not and there is a perceptible air gap then you must make an estimated and educated guess as to the true size of the ring. You should also record and make a note in your report stating the ring is not perfectly round. I personally use a simple comment in my reports as, Round, Slightly Out-of-Round, Ovaled or Egg- Shaped due to stone setting issues. ***You should measure and record the ring size to the closest ¼ size*** On the following page is a chart of ring size diameters please double check your ring mandrels against the printed and accepted ring size diameters. Use the printed ring size diameter and don t mistakenly use the length measurement by mistake. Start now and build a Laboratory Equipment Maintenance, Re-Calibration and Re-Certification Log/Journal On one page list the ring mandrels you generally use and record each size and half size on your ring manual and then double check it against the chart on the following page and make any notes and comments as to the variances so you can see where your ring mandrel is accurate and where it is inaccurate. As you will see a mere 0.50mm / 1/2mm difference in ring size diameter is equal to ½ ring size so please be aware of these tolerances and inaccuracies. You also need to remember the RING SIZE is in fact an Identifying Attribute, so please record it and treat it as such. Another attribute associated with ring size is to list if the ring is a closed back, open back, closed back with pierced bridge gallery and such. I personally list these features in all of my own appraisals. Closed Back, Closed Back Solid, Closed Back / Cleaning Hole(s), Closed Back Hollow Shoulders, Open Back, Open Back / Pierced Gallery Cast, Open Back / Pierced Gallery - Hand Pierced, Semi-Open Back, Underside Pieced Gallery, Cast Pierced Gallery, Hand Fabricated Pierced Gallery, Sizing Balls, Speed Bumps, Inside Sizing Spring, Arthritic Adjustable Ring Shank Page 2 of 17
3 Page 3 of 17
4 ***Important Note*** If you have a ring with sizing balls, speed bumps or inside sizing spring you can still measure and record an accurate size of the ring by using the inside diameter measuring side of your calipers and measure across the inside of the ring in several areas and average them out and then use the handy-dandy conversion chart and you can estimate the original ring size. However make sure you make a notation or comment within your report stating that the ring has sizing balls, speed bumps, inside ring spring or if it has an adjustable arthritic shank as these are important indentifying attributes. Additional Measurements to record and insert into your reports: ***Important Reminder*** Remember, these critical measurements are in fact Identifying Attributes, so please record them and treat them as such. Top of Mounting Measurements: Width & Thickness Shank, Top of Shoulders: Width & Thickness Shank, Bottom of Ring Shank: Width & Thickness There is a very important reason why these measurements need to be taken and recorded in your report and I ll explain them later towards the end of the article. ***Important Note*** I personally measure and record these measurements out to the closest 0.10mm 1/10mm. All Six (6) of these measurements can be taken and recorded in less than Two (2) Minutes. Therefore, there is absolutely no acceptable excuse as to why you as a Professional Appraiser DID NOT measure, record and report these critical measurements within your report. *** Important Reminder *** Remember you are holding yourself out and projecting yourself as a professional to your clients so you better act in a professional manner and perform a reasonable degree of due diligence when performing your duties and tasks as a professional appraiser of gems and jewelry. Page 4 of 17
5 Common Instruments Used to Measure Important Critical Areas of any Mounting: Steel or Brass Slide Gauge Steel Boley-Style Vernier Calipers I personally like this style of caliper when measuring mountings due to the long jaws and also the ability to measure inside the mountings to measure metal thickness due to the C- type cutout opposite the straight jaws Dial Readout Caliper Digital Readout Caliper I also like these digital readout Calipers due to how quickly you can read and record the large digital readout. However, I like the shorter 4 length version as it fits in my hand easier and is not as heavy and clumsy as the big long 6, 8, or 12 calipers you commonly find at tool warehouse or tool discount stores. Page 5 of 17
6 Top of Mounting Measurements: Width & Thickness Measuring the width of the ring down the centerline or the widest part parallel to the ring shank Measuring the thickness of the ring at the thickest point at or near the centerline at the top of the ring Even with large center stone rings measure the width at the widest part of the ring at or near the top even if you are measuring the stone itself. Measure the thickness of the ring at the top even if you are measuring on top of the stone or even measuring across the top of the prongs. There is a very important reason for doing this and I will explain it near the end of this article. ***Important Reminder*** Measure and record to the nearest 0.10mm 1/10mm Page 6 of 17
7 Shank, Top of Shoulders: Width & Thickness Measuring the Width and Thickness of the Ring Shank at the Top of the Shoulders can be subjective in some instants. If you look closely at this ring shank you will see that it tapers inward ever so slightly near the center head. In this case measure where the ring shank near the top is the widest. ***Important Reminder*** Measure and record to the nearest 0.10mm 1/10mm Page 7 of 17
8 Shank, Top of Shoulders: On a ring shank like this you need to measure slightly more off to the shoulders. Notice the green lines and arrows Each ring will present various differences so to measure the shoulder width and thickness is basically on a case-by-case basis. The more you do it the more comfortable you will get at it and before long you just automatically do it without thinking. It s not that hard to master, practice makes perfect Page 8 of 17
9 Shank, Bottom of Ring Shank: Width & Thickness Measuring the Width and Thickness at the Bottom of the Ring Shank is pretty straight forward ***Important Reminder*** Measure and record to the nearest 0.10mm 1/10mm ***Important Repair Notice*** If the bottom of the ring shank is less than 1.0mm thick then you should advise your client to have the ring re-shanked as there is a possible durability issue. However you DO NOT need to list this comment or notation is your report. Just give your client a friendly reminder. Page 9 of 17
10 Special Features and Attributes: Notice the Green Arrows: Hollowed out Shoulders Closed Back Center Support Bar Cleaning holes Locking Key Bar to keep both rings together without slipping or twisting Rings are soldered together All of these special attributes should be listed in your report regarding this ring. Notice the Red Arrows: Open Back Hollowed out Shoulders Cleaning Holes ***Special Side Note*** Page 10 of 17 Do you see the mold line nearly down the center of the hollowed out shank? Bottom of cleaning holes not counter-sunk Poor Quality Control and Lack of Attention to Detail Quality of Workmanship: Below Average. Manufacturing Method Cast Mass Produced I personally refer to this as Commercial Grade Cookie-Cutter Mass Produced Jewelry I will explain in considerable detail in an upcoming article and hands-on seminar called, Connoisseurship Identifying, Listing and Grading the Quality of Workmanship February 2008 Updated
11 Broach Mounting Measurements: Most broaches are pretty straight forward ***Important Reminder*** Measure and record to the nearest 0.10mm 1/10mm Length x Width x Depth/Thickness I prefer to measure TOTAL THICKNESS, the red lines on the right. You can also measure the thickness of the main plate used and list the thickness of the plate either in millimeters or gauge size. ***Special Side Note*** Do you know the correct name of the type of clasp found on this broach? Can you date this piece just by the clasp alone? This is a close-up of the clasp on the broach. Page 11 of 17
12 Pendant Mounting Measurements: Measuring Length, Width and Thickness of an unusual shaped pendant You can also measure the diameter of the wire that makes the arrow shaft You can also measure the width and thickness of the feather portion of the arrow ***Special Side Note*** This was a custom-made, hand assembled pendant. It IS NOT Hand-Fabricated nor is it Hand-made because the marquise head and split bezel are pre-made items and those pieces make up approximately 50% of the item so it really can t be called anything other than Hand-Assembled and Custom-Made. ***Important Side Note*** This is the KEY! The reason for taking these measurements is because if you have these measurements recorded and also have clear well focused pictures of the item, Top View, Side View, Profile View, Bottom View or Back View you can if need be use a digital image measuring program and with your measurements inputted into the program the reference measurement(s) you can then effectively measure any portion of the item with relative accuracy. Page 12 of 17
13 This is a complicated pendant that is actually a combination piece. The Cameo Pendant with the diamond bezel was originally made then at a later date the rest of the pendant was built around the original piece. Since it was so complex with so many different sizes of stone I found that it was easier to first take a picture of the piece. I then blew up the picture on a 8 ½ X 11 page and then recorded all of my notes on the page and then once done I then re-scanned the page and saved it to the client s file folder. I could only estimate the color of the stones through the crown portion of the stones due to how they were mounted. I then added my limiting conditions stating the special conditions that I encountered during this appraisal assignment. This was a fun yet time consuming assignment. There was a lot more than what was listed on this page due to how it was made and then assembled. The emerald crystal was really cool and had a very interesting story as to how the lady came into possession of it. Page 13 of 17
14 Measuring Mounted Gemstones and Diamonds: Tools needed and/or required: Digital/Dial Leverage Style Gauge with high setting attachment, Digital/Dial Calipers, Table Gauge Transparency, Various Diamond Shape & Size Transparencies, and Calibration Blocks. I first started out with a dial Leverage Gauge and then I switched to the new Digital Caliper as seen above. The cool thing is that is gauge accepts my old high setting attachment perfectly and best of all this digital gauge costs less than $ and is even more accurate than my old dial gauge and it is faster too. I also like the new digital calipers and my favorite one is the 4 model as it is smaller and easier to handle. It also has an inside diameter jaws and it is great to measure inside diameter of rings or inside a head that a stone was knocked out of or measure the inside of a head before saying a stone will or will not fit in that mounting. The end of the calipers can also measure depth too. Page 14 of 17
15 Transparences: Transparences are also very helpful too in estimating stone size be it straight or tapered baguettes. To correctly and properly measure mounted gemstones is only slightly different than measuring them when they are loose. Every gemologist should be able to measure gemstones mounted or loose. Diameter, Width, Length and Depth. ***Extremely Important*** The most important aspect of the measuring process of mounted gemstones is to correctly and clearly state how the measurements were taken. Method of Measurements taken: Actual Approximate Estimated Actual-Digital Diameter-Digital Depth Actual-Table Gage Diameter-Digital Depth Actual-Table Gage Diameter-Table Gage Depth Actual-Digital Diameter-Table Gage Depth Actual-Table Gage Diameter-Estimated Depth Actual-Digital Diameter-Estimated Depth Approximate-Estimated Diameter-Estimated Depth Or any various combination Page 15 of 17
16 Calibration Blocks: Every gemologist should have a set of these calibration blocks to routinely check and verify that your linear measuring devices are accurate and working within acceptable tolerances. ***Important Notice*** These calibration blocks SHOULD NEVER be handled with your bare hands. You should always wear lint free gloves when using and handling these precision calibration blocks because just the oil in your fingertips can cause various problems. Start now and build a Laboratory Equipment Maintenance, Re-Calibration and Re-Certification Log/Journal Once a month you should clean all of your measuring devices and then check their accuracies with your set of calibration blocks. You should have a log book and each instrument should be checked and the results should be recorded in your log book. This is all part of being a professional. Page 16 of 17
17 The Moon over the Black Rock Desert, Northern Nevada also the Home of Burning Man This was a simple A-Focal Photograph taken through my 90mm Stellarvue Refractor Telescope You are only viewing the picture at 50% of actual size. Using my trustee Pentax Optio 33WR Thanks for taking time to read my article and I hope you learned a thing or two and had fun all at the same time. Please me with your comments and suggestions. To learn more about my systematic approach to appraisal data collection check it out at While you are at it checkout GemologyOnline at Better yet register and become a member of one of the best gemology sites on the web. Page 17 of 17
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