Observations of this cluster component star colours was conducted by the ASNSW's "Double Star Section" in the early-1980's. Here some thirty-four observers went out and observed to examined ten selected stars in the Jewel Box.
| Star No. | Colour Observed | Mag | Spectral Class | Hagen Colour Index |
| 1 | White (Bluish) | 5.89 | B4 | 3.8 ± 1.8 |
| 2 | White (Yellowish) | 5.75 | B9 | 4.4 ± 1.6 |
| 3 | White (Yellow) | 6.8 | B3 | 4.2 ± 2.5 |
| 4 | White (Yellowish) | 7.0 | B1.5 | 4.2 ± 1.9 |
| 5 | Reddish-Orange | 7.2 | M2 | 11.3 ± 2.2 |
| 6 | White (Grey) | 8.0 | A ? | 3.8 ± 2.9 |
| 6a | White-yellowish | 10.0 | B ? | 4.2 ± 3.2 |
| 12 | Blue-White (Grey) | 9.1 | B2 | 3.0 ± 1.9 |
| 10 | White (Bluish) | 8.2 | B1 | 3.7 ± 2.0 |
| 16 | White | 9.7 | A ? | 3.7 ± 2.0 |
Table 2 shows the colours calculated using the Hagen Colour Index (HCI), which is a standard colour scale for double stars, The scale follows:
| -3 | Pure Blue |
| -2 | Pale Blue (Bluish) |
| -1 | Blue / White |
| 0 | Pure White |
| 1 | Yellowish/white |
| 2 | Pale Yellow (Yellowish) |
| 3 | Pure Yellow |
| 4 | Orange /Yellow |
| 5 | Yellow / Orange |
| 6 | Pure Orange |
| 7 | Reddish / Orange |
| 8 | Orangery / Red |
| 9 | Red / Orangery |
| 10 | Pure Red |
“Southern Astronomical Delights” © Andrew James (2002) Sydney, Australia