From: GoldMoney - Frequently Asked Questions
http://goldmoney.com

No, there is no minimum or maximum amount for metal purchases, sales or exchanges.

There is, however, a limit as to how much metal you can buy or sell at a 'locked rate', which is the prevailing rate of exchange between a currency and the metal you are purchasing at the time you place your order. Presently those limits are 2,000 goldgrams, 2,000 silver ounces and 1,000 platinum grams per business day, for metal purchases and sales. For metal exchanges (e.g., converting goldgrams directly into silver ounces) the limit is 1,000 goldgrams, 1,000 silver ounces and 500 platinum grams per business day.

A "business day" for gold is defined as the period starting at 14:30:00 (9:30 a.m. New York time) local London time on a day the London bullion market is open until 14:29:59 the next day the London bullion market is open. A "business day" for silver starts at 11:30:00 (6:30 a.m. New York time) and ends at 11:29:59, and for platinum starts at 12:30:00 (7:30 a.m. New York time) and ends at 12:29:59. During the trading week, the "business day" for each metal is a 24 hour period based on the above starting/ending times. A "business day" beginning on Friday at 14:30:00 is a 72 hour period until the following Monday at 14:29:59.

Larger orders above these limits can of course be placed, but we cannot confirm the purchase or selling rate when you place your order. Instead, the exchange rate is based upon the first London 'Fixing Price' after the order is placed.

These limits can change at any time because of market conditions or other factors. See our FAQ on daily limits for more details.