UK, 1854: London Chemist's Catalogue

1854: 1 Troy Ounce Silver (London Mkt) = £ 0.277 (USD$ 1.3519)

1854: 1 Troy Oz. Platinum (semi-mfg., wholesale) = £ 0.425 (USD$ 2.074)

1854: 1 Troy Ounce platina (Ore, Retail) = £ 1.50 (USD$ 7.32)

1854: 1 Troy Oz. Platinum (Semi-Mfg., Trade) = £ 1.38 (USD$ 6.71)

1854: 1 Troy Oz. Platinum (Manufactured, Trade) = £ 1.50 (USD$ 7.32)

Citation: Descriptive and general catalogue of philosophical apparatus and chemical ... ; Bland & Long (1854), p.14

1854: 1 Troy Oz. Osmium (refined) = £ 24. (USD$ 117.12)

1854: 1 Troy Oz. Palladium (refined) = £ 1.50 (USD$ 7.32)

1854: 1 Troy Oz. Rhodium (refined) = £ 12. (USD$ 58.56)

Retail Silver was 53.41% more expensive than Market, at the intrinsic rate.

1854: 1 Troy Oz. Platinized Silver (Sheet, Ret.)= £0.50 -£0.55 (USD$ 2.44-2.68)
1854: 1 Troy Oz. Silver (Sheet, Ret.)= £0.4250 (USD$ 2.07)

At 0.0026 Inches thickness, the weight of 60 Platinized Silver Plates, 3"x 5" (900 Sq. In. of Silver Sheet; 1,800 Sq. In. area) was 13.15 Ozt.  At the 1839 rate, less than 0.007 Ozt Pt was employed to platinize this amount of Silver Sheet; the wholesale price was 44.35% higher than Market Silver at the intrinsic rate (not factoring labor, profit, etc.)

Catalogue trade/retail was also 37.5% higher than the Producer's Bulk.

1854: 1 Troy Oz. Platinized Silver (Producer, bulk) = £0.3999 (USD$ 1.95)