G01N 33/389
Precious stones
Official title: {Precious stones; Pearls}
G01N33/389 (Precious stones) appears on 144 US grants and 137 published applications in this corpus.
Search patents in G01N- Granted patents
- 144
- Published applications
- 137
- Assignees
- 93
- Inventors
- 288
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 3 | 0 |
| 2005 | 1 | 5 |
| 2006 | 2 | 1 |
| 2007 | 1 | 2 |
| 2008 | 2 | 2 |
| 2009 | 1 | 2 |
| 2010 | 0 | 2 |
| 2011 | 1 | 2 |
| 2012 | 2 | 6 |
| 2013 | 1 | 1 |
| 2014 | 2 | 6 |
| 2015 | 5 | 4 |
| 2016 | 7 | 11 |
| 2017 | 8 | 8 |
| 2018 | 5 | 2 |
| 2019 | 7 | 13 |
| 2020 | 9 | 13 |
| 2021 | 9 | 12 |
| 2022 | 11 | 16 |
| 2023 | 6 | 5 |
| 2024 | 15 | 13 |
| 2025 | 13 | 6 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and methods for ultrafast widefield quantum sensing using neuromorphic vision sensors8 Sep 2026US 12,730,165 B2The University of Hong Kong
- System and method for evaluating and determining color in gemstones9 Jun 2026US 12,650,387 B1Sarine Technologies Ltd.
- Gemstone testing device9 Jun 2026US 12,650,388 B2Jubilee Diamond Instrument (S) Pte. Ltd.
- Gemstone multi-tester instrument with removable probe28 Apr 2026US 12,613,185 B2Smart Pro Instrument Co., Ltd.
- System and method for evaluating the ethical sourcing of stones2 Dec 2025US 12,487,228 B1
- Optically detected magnetic resonance with light-sheet microscopy9 Jul 2026US 2026/0194465 A1The Chinese University of Hong Kong
- Precious Stone Testing Apparatus and Method Thereof26 Mar 2026US 2026/0086024 A1Shenzhen Dikai Industrial Co., Ltd.
- Pearl grading instrument and methods18 Dec 2025US 2025/0383295 A1Gemological Institute of America, Inc. (GIA)
- Apparatus and method for fluorescence grading of gemstones16 Oct 2025US 2025/0321189 A1Gemological Institute of America, Inc. (GIA)
- Luminescence imaging for gemstone screening10 Jul 2025US 2025/0224338 A1Gemological Institute of America, Inc.
Most cited
By later US patents
- Method and device for distinguishing material by thermal conductivity63US 4,344,315 ACeres Electronics Corporation · 1982
- Method and apparatus for identifying gemstones, particularly diamonds52US 5,118,181 AWellborn Ltd. · 1992
- Gem identification43US 3,947,120 AYeda Research and Development Co. Ltd. · 1976
- Gemstone registration system40US 5,828,405 AOmphalos Recovery Systems Inc. · 1998
- Method and apparatus for measuring objects, particularly useful for measuring diamonds39US 6,397,678 B12002