| Sold | Grade | Monthly Average |
| May 2026 | 6.0 | $4.28 |
| May 2022 | 7.5 | $15.00 |
| Dec 2021 | 7.5 | $15.00 |
| Dec 2011 | 7.5 | $8.10 |
| Oct 2023 | 6.0 | $7.50 |
| Aug 2022 | 6.0 | $16.00 |
| Aug 2013 | 6.0 | $6.25 |
| Jun 2011 | 5.5 | $5.20 |
| Jan 2013 | 4.5 | $4.30 |
| Jul 2025 | 4.0 | $8.00 |
| Jan 2025 | 4.0 | $8.00 |
| Jun 2020 | 4.0 | $9.60 |
| Nov 2019 | 3.5 | $7.60 |
| Aug 2010 | 3.0 | $1.40 |
| Jan 2024 | 2.0 | $4.80 |
| Oct 2023 | 2.0 | $4.80 |
| Dec 2013 | 1.8 | $1.70 |