{"title":"Diamond Testers","description":"\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eThis collection chronicles the advancement of \u003cb data-path-to-node=\"0\" data-index-in-node=\"46\"\u003enon-destructive authentication\u003c\/b\u003e, from early thermal probes to modern multi-sensor platforms and electronic colorimeters. These instruments provide a quantitative bridge between visual inspection and laboratory spectroscopy, utilizing \u003cb data-path-to-node=\"0\" data-index-in-node=\"279\"\u003ethermal and electrical conductivity\u003c\/b\u003e to distinguish true diamonds from sophisticated simulants. By standardizing the identification of physical properties, these tools remain the frontline defense in maintaining the global integrity of the gemological trade.\u003c\/p\u003e","products":[{"product_id":"excel-diamond-sensor-diamond-tester-1980s","title":"Excel Diamond Sensor Diamond Tester 1980s","description":"","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":51558094897472,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/Cat_DiamondTester1.gif?v=1771891483"},{"product_id":"culti-original-diamond-selector-i","title":"Culti Original Diamond Selector I","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-69d0a42a-2728-83e8-981e-93b21b91f7e7-0\" data-testid=\"conversation-turn-34\" data-scroll-anchor=\"true\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"9244a960-34d5-4b50-9c88-82a654017a17\" dir=\"auto\" data-message-model-slug=\"gpt-5-3\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp data-start=\"39\" data-end=\"692\"\u003eThe \u003cem data-start=\"43\" data-end=\"61\"\u003eDiamond Selector\u003c\/em\u003e, manufactured by Culti of Japan, represents one of the earliest commercially successful portable diamond testers, marking a significant advancement in practical gemstone identification during the late 20th century. Designed to provide rapid, user-friendly results, this instrument operates on the principle of thermal conductivity—measuring the rate at which heat passes through a האבן to distinguish diamond from common simulants such as cubic zirconia and glass. Its introduction brought laboratory-level testing capability into retail and field environments, greatly enhancing efficiency and confidence in diamond verification.\u003c\/p\u003e\n\u003cp data-start=\"694\" data-end=\"1062\"\u003eCompact and intuitive in design, the Diamond Selector features a handheld probe and indicator system that delivers near-instant readings with minimal training required. This accessibility made it especially popular among jewelers and gem traders, contributing to its widespread adoption and establishing it as a benchmark for subsequent generations of diamond testers.\u003c\/p\u003e\n\u003cp data-start=\"1064\" data-end=\"1369\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eAs an original model produced by Culti, this piece holds both historical and technological significance. It reflects a pivotal moment in gemology when electronic instrumentation began to transform traditional testing methods, bridging the gap between classical observation and modern analytical precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":51762907545920,"sku":null,"price":250.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/DiamondSelector1_7a686c93-5641-4d90-ad7e-5c1868955b39.avif?v=1775988261"},{"product_id":"ags-shipley-diamond-colorimeter-c-1960","title":"AGS Shipley Diamond Colorimeter (c. 1960)","description":"\u003cp data-path-to-node=\"1\"\u003eThe 1960 Shipley Diamond Colorimeter represents a pivotal era in the transition from subjective \"master eye\" grading to objective, instrument-based diamond analysis. Developed for the American Gem Society (AGS) by Robert M. Shipley Jr., this unit holds immense historical significance as the first non-visual electronic colorimeter ever manufactured for diamond grading. Because production was limited and the technology has its weaknesses, very few units exist today, making this a remarkably rare artifact of gemological history that embodies the industry's early commitment to \"Science over Sentiment.\"\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eThe device operates on the principle of differential light transmission, measuring how much light a diamond absorbs across specific wavelengths—primarily the \"yellow\" end of the spectrum where nitrogen impurities are most active. To operate the unit, a technician first calibrates the device using a \"blank\" standard to establish a zero-point for 100% transmission. The diamond is then placed table-down in a light-shielded well, and a stabilized light source is passed through the stone. A photoelectric cell captures the exiting light, converting it into an electronic signal that is displayed on a galvanometer needle-gauge, which corresponds to the standardized AGS or GIA color scales.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eDespite its revolutionary status, the 1960 Colorimeter possessed technical weaknesses. A primary limitation was its sensitivity to fluorescence; the blue emission from fluorescent diamonds could \"trick\" the photoelectric cell, leading to inaccurate readings of the stone's true body color. Additionally, the device was susceptible to geometric interference, where the specific cut or proportions of a diamond could cause light leakage or internal reflection. This colorimeter could not rotate and average the color of diamond over 360° as well.  Modern patents have since solved these early hurdles by utilizing integrating spheres and multiple light sources to ensure a level of accuracy that this analog pioneer first made possible.\u003c\/p\u003e","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":51857693540672,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/ShipleyColorimeter1_34db5a8b-2081-4346-a3ab-bc72bf56febb.avif?v=1776668705"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/collections\/Cat_Diamond_tester_d8a6ca2d-174f-4b2b-be4a-b35a015a47e9.png?v=1775988491","url":"https:\/\/gems.studio\/collections\/chelsea-filters.oembed","provider":"Gems.studio","version":"1.0","type":"link"}