G01N 21/87
Investigating jewels
Official title: Investigating jewels (G01N21/88 takes precedence)
G01N21/87 (Investigating jewels) appears on 424 US grants and 415 published applications in this corpus.
Search patents in G01N- Granted patents
- 424
- Published applications
- 415
- Assignees
- 182
- Inventors
- 658
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 6 | 3 |
| 2002 | 4 | 5 |
| 2003 | 6 | 5 |
| 2004 | 6 | 10 |
| 2005 | 2 | 16 |
| 2006 | 9 | 13 |
| 2007 | 9 | 13 |
| 2008 | 15 | 8 |
| 2009 | 4 | 11 |
| 2010 | 7 | 20 |
| 2011 | 5 | 6 |
| 2012 | 12 | 12 |
| 2013 | 15 | 16 |
| 2014 | 14 | 18 |
| 2015 | 14 | 18 |
| 2016 | 17 | 25 |
| 2017 | 16 | 19 |
| 2018 | 19 | 22 |
| 2019 | 23 | 23 |
| 2020 | 19 | 23 |
| 2021 | 20 | 28 |
| 2022 | 24 | 25 |
| 2023 | 19 | 26 |
| 2024 | 30 | 28 |
| 2025 | 21 | 18 |
| 2026 | 15 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tilt and focusing adjustment for consistent gem imaging6 Oct 2026US 12,754,140 B2Gemological Institute of America, Inc. (GIA)
- Systems and methods for reliable authentication of jewelry and/or gemstones18 Aug 2026US 12,710,373 B2
- Melee gemstone sorting machine and methods for analysis11 Aug 2026US 12,703,009 B2Gemological Institute of America, Inc. (GIA)
- 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.
- Universal gemstone cut identification device and method18 Jun 2026US 2026/0168935 A1Max Planck Postech/Korea Research Initiative
- System for testing the characteristics of precious stones7 May 2026US 2026/0126397 A1ETA SA Manufacture Horlogere Suisse
- Precious Stone Testing Apparatus and Method Thereof26 Mar 2026US 2026/0086024 A1Shenzhen Dikai Industrial Co., Ltd.
- Digital image gemstone verification with filters8 Jan 2026US 2026/0009734 A1Gemological Institute of America, Inc. (GIA)
- Inscription Loupe25 Dec 2025US 2025/0389947 A1Shenzhen Dikai Industrial Co., Ltd.
Most cited
By later US patents
- Laser marking system147US 5,932,119 ALazare Kaplan International, Inc. · 1999
- Brewster angle refractometer115US 5,572,314 A1996
- Apparatus and method for grading, testing, and identifying gemstones96US 6,239,867 B1Imagestatistics, Inc. · 2001
- Method and associated apparatus for the standardized grading of gemstones75US 6,980,283 B1Imagestatistics, Inc. · 2005
- System and method for computerized evaluation of gemstones66US 5,966,673 ADiamond Technologies Company · 1999